Visitors watch as the world's largest cuckoo clock chimes one o'clock in front of the souvenir shop Uhrenpark Ebele, in the Black Forest town of Triberg, Germany September 26, 2021. REUTERS/Arnd Wiegmann 

Visitors watch as the world's largest cuckoo clock chimes one o'clock in front of the souvenir shop Uhrenpark Ebele, in the Black Forest town of Triberg, Germany September 26, 2021. REUTERS/Arnd Wiegmann 

Bird house wall clock named Coucou is pictured in a watchmaker's shop in Bordeaux, France, January 27, 2018. REUTERS/Regis Duvignau 

Bird house wall clock named Coucou is pictured in a watchmaker's shop in Bordeaux, France, January 27, 2018. REUTERS/Regis Duvignau 

Bird house wall clock named Coucou is pictured in a watchmaker's shop in Bordeaux, France, January 27, 2018. REUTERS/Regis Duvignau 

Wall clocks are seen in the Casa Del Cucu Aleman watch store in Bogota, Colombia, January 26, 2018. REUTERS/Jaime Saldarriaga 

Cup cakes are displayed in the window of Cuckoo's bakery in Edinburgh, in Scotland September 17, 2014. The bakery had been running the 'Cuckoo's cup cake opinion poll', for 200 days, displaying the percentage of cakes sold in each of three categories.The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Russell Cheyne (BRITAIN - Tags: POLITICS TPX IMAGES OF THE DAY ELECTIONS)

Cup cakes are displayed in the window of Cuckoo's bakery in Edinburgh, in Scotland September 17, 2014. The bakery had been running the 'Cuckoo's cup cake opinion poll', for 200 days, displaying the percentage of cakes sold in each of three categories.The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Russell Cheyne (BRITAIN - Tags: POLITICS ELECTIONS) 

Cup cakes are displayed in the window of Cuckoo's bakery in Edinburgh, in Scotland September 17, 2014. The bakery had been running the 'Cuckoo's cup cake opinion poll', for 200 days, displaying the percentage of cakes sold in each of three categories.The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Russell Cheyne (BRITAIN - Tags: POLITICS ELECTIONS)

Cup cakes are displayed in the window of Cuckoo's bakery in Edinburgh, in Scotland September 17, 2014. The bakery had been running the 'Cuckoo's cup cake opinion poll', for 200 days, displaying the percentage of cakes sold in each of three categories.The referendum on Scottish independence will take place on September 18, when Scotland will vote whether or not to end the 307-year-old union with the rest of the United Kingdom. REUTERS/Russell Cheyne (BRITAIN - Tags: POLITICS ELECTIONS) 

A Great Spotted Cuckoo is seen on Tenby Golf Course in Pembrokeshire, Wales March 13, 2014.. The species which usually winters in Africa and breeds in France, Italy, Spain and Portugal is a rare sight in the UK. Picture taken March 13, 2014. REUTERS/Rebecca Naden (BRITAIN - Tags: ANIMALS SOCIETY) 

Bird watchers look through telescopes to try to spot a Great Spotted Cuckoo on Tenby Golf Course in Pembrokeshire, Wales March 13, 2014. Bird watchers came from all over the UK to see the Great Spotted Cuckoo, a species which usually winters in Africa and breeds in France, Italy, Spain and Portugal, and is rarely seen in the UK. Picture taken March 13, 2014. REUTERS/Rebecca Naden (BRITAIN - Tags: ANIMALS SOCIETY) 

A bird watcher carrying a telescope and tripod to try to spot a Great Spotted Cuckoo walks on Tenby Golf Course in Pembrokeshire, Wales March 13, 2014. Bird watchers came from all over the UK to see the Great Spotted Cuckoo, a species which usually winters in Africa and breeds in France, Italy, Spain and Portugal, and is rarely seen in the UK. Picture taken March 13, 2014. REUTERS/Rebecca Naden (BRITAIN - Tags: ANIMALS SOCIETY) 

Bird watchers look through telescopes to try to spot a Great Spotted Cuckoo on Tenby Golf Course in Pembrokeshire, Wales March 13, 2014. Bird watchers came from all over the UK to see the Great Spotted Cuckoo, a species which usually winters in Africa and breeds in France, Italy, Spain and Portugal, and is rarely seen in the UK. Picture taken March 13, 2014. REUTERS/Rebecca Naden (BRITAIN - Tags: ANIMALS SOCIETY) 

Masked Romanian characters participate in the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Masked Romanian characters participate in the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest, March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Masked Romanian characters participate in the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Bulgarian characters participate in the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Masked Romanian characters participate in the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

A masked Romanian character participates in the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest, March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

A masked Bulgarian character called Kukeri participates in the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

A Romanian woman talks to Bulgarian characters called Kukeri during the annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

A masked Romanian character participates in an annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

A masked Romanian character participates in an annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Masked Romanian characters participate in an annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest, March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Masked Bulgarian characters called Kukeri participate in an annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Masked Romanian characters participate in an annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

Masked Romanian characters participate in an annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

A masked Romanian boy participates in an annual "Ziua cucului" (Cuckoos Day) festival in Branesti, near Bucharest March 3, 2014. Several groups from Romania and Bulgaria gathered to take part in the festival, dancing for good health and fertility. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY ENTERTAINMENT) 

A combination photo of German stereotypes as thought of by non-Germans. Pictured clockwise from top left : Garden gnomes; cuckoo clocks; no road speed limitations; jelly bear sweets; neo-Nazis; Bauhaus; Techno music and grilled pork hock. Pictured centre: traditional Dirndl dress. The Bavarian election will be held on September 15, 2013 and the German general election on September 22, 2013. INDIVIDUAL IMAGES WILL FOLLOW THIS COMBINATION REUTERS/Staff/Files (GERMANY - Tags: ELECTIONS POLITICS SOCIETY) 

A participant lands his self-made cuckoo clock themed vehicle in the finish area after a jump during a soapbox fun race in the western German town of Herten, near Gelsenkirchen, July 14, 2013. REUTERS/Wolfgang Rattay (GERMANY - Tags: SOCIETY) 

Cuckoo clocks are on display at a stall in a Christmas market in Potsdam, December 17, 2012. German consumer morale dropped for the fourth month running to its lowest level in more than a year as shoppers become increasingly wary of the effect the euro zone debt crisis is having on Europe's largest economy. Picture taken December 17, 2012. REUTERS/Thomas Peter (GERMANY - Tags: SOCIETY)

Men wearing face masks take part in the "Ziua Cucului" (Cuckoo's Day) during a fair in Bucharest March 26, 2011. Cuckoo's Day is an event which men from southern Romania wear face masks to perform traditional dance and rituals for good health and fertility. According to local tradition, the cuckoo chirps on March 25 of every year, symbolising the start of spring. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY) 

A man wearing a face mask takes part in the "Ziua Cucului" (Cuckoo's Day) during a fair in Bucharest March 26, 2011. Cuckoo's Day is an event which men from southern Romania wear face masks to perform traditional dance and rituals for good health and fertility. According to local tradition, the cuckoo chirps on March 25 of every year, symbolising the start of spring. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY) 

Men wearing face masks take part in the "Ziua Cucului" (Cuckoo's Day) during a fair in Bucharest March 26, 2011. Cuckoo's Day is an event which men from southern Romania wear face masks to perform traditional dance and rituals for good health and fertility. According to local tradition, the cuckoo chirps on March 25 of every year, symbolising the start of spring. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY) 

Men wearing face masks take part in the "Ziua Cucului" (Cuckoo's Day) during a fair in Bucharest March 26, 2011. Cuckoo's Day is an event which men from southern Romania wear face masks to perform traditional dance and rituals for good health and fertility. According to local tradition, the cuckoo chirps on March 25 of every year, symbolising the start of spring. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY) 

Men wearing face masks take part in the "Ziua Cucului" (Cuckoo's Day) during a fair in Bucharest March 26, 2011. Cuckoo's Day is an event which men from southern Romania wear face masks to perform traditional dance and rituals for good health and fertility. According to local tradition, the cuckoo chirps on March 25 of every year, symbolising the start of spring. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY) 

A man wearing a face mask takes part in the "Ziua Cucului" (Cuckoo's Day) during a fair in Bucharest March 26, 2011. Cuckoo's Day is an event which men from southern Romania wear face masks to perform traditional dance and rituals for good health and fertility. According to local tradition, the cuckoo chirps on March 25 of every year, symbolising the start of spring. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY) 

A man wearing a face mask takes part in the "Ziua Cucului" (Cuckoo's Day) during a fair in Bucharest March 26, 2011. Cuckoo's Day is an event which men from southern Romania wear face masks to perform traditional dance and rituals for good health and fertility. According to local tradition, the cuckoo chirps on March 25 of every year, symbolising the start of spring. REUTERS/Bogdan Cristel (ROMANIA - Tags: SOCIETY) 

An actress playing the part of Nurse Mildred Ratched speaks with an actor playing Jack Nicholson's character R.P. McMurphy before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers clad in bathrobes visit the roof of a disused seniors' home, decorated to resemble an Oregon psychiatric hospital, before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers watch a scene showing actor Jack Nicholson's character R.P. McMurphy during Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers watch a scene showing actor Jack Nicholson's character R.P. McMurphy during Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers watch the opening scenes of Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers clad in bathrobes attend Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

An actress playing the part of Nurse Mildred Ratched addresses moviegoers before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

An actress playing the part of Nurse Mildred Ratched waits for viewers to be seated before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers clad in bathrobes walk in a disused seniors home decorated to resemble an Oregon psychiatric hospital, before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers clad in bathrobes walk in a disused seniors home decorated to resemble an Oregon psychiatric hospital, before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

A moviegoer lies on a cot near an actress playing the part of a psychiatric hospital doctor before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers clad in bathrobes play with non functioning electro shock therapy equipment before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers watch a demonstration of lobotomy techniques by an actor playing the part of psychiatric hospital doctor before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers take part in an art exercise while watched by actresses playing the part of psychiatric hospital nurses before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

An actor playing the part of a psychiatric hospital patient performs before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Actors playing the part of a psychiatric hospital patient (R) and nurse embrace during a performance prior to Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers watch an actor playing the part of a psychiatric hospital patient (R) before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Moviegoers watch an actor playing the part of a psychiatric hospital patient (R) before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

Actresses playing the part of a psychiatric hospital patient and nurse are watched by moviegoers, before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

An actress (R) playing the part of a psychiatric hospital patient is watched by moviegoers, before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY) 

An actor playing the part of Jack Nicholson's character R.P. McMurphy arrives at a group therapy session watched by moviegoers, before Secret Cinema's closing night screening of the film "One Flew Over The Cuckoo's Nest" in west London November 21, 2010. Since 2007, Secret Cinema has championed a new type of participatory movie event where viewers are sold tickets but not told anything about the film they are to see, only what to wear and where to meet. Picture taken November 21, 2010. REUTERS/Chris Helgren (BRITAIN - Tags: ENTERTAINMENT SOCIETY)