A photographer runs away from participants as he is targeted during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

A firefighter sprays water on participants during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during the Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Participants play with water guns during Sinchon Water Gun Festival in Seoul, South Korea, July 9, 2016. REUTERS/Kim Hong-Ji 

Children run through water spraying from a fire hydrant in the Queens borough of New York, U.S., July 6, 2016. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY

Children play in the water spraying from a fire hydrant in the Queens borough of New York, U.S., July 6, 2016. REUTERS/Shannon Stapleton 

Children play in the water spraying from a fire hydrant in the Queens borough of New York, U.S., July 6, 2016. REUTERS/Shannon Stapleton 

A child plays in the water spraying from a fire hydrant in the Queens borough of New York, U.S., July 6, 2016. REUTERS/Shannon Stapleton 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

A reveller reacts during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

Revellers react during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva 

A reveller reacts during a water fight at Songkran Festival celebrations in Bangkok April 13, 2016. REUTERS/Jorge Silva TPX IMAGES OF THE DAY 

A protester wearing a red nose sprays Lebanese security members with a water gun during a protest against perceived government failures, including a rubbish disposal crisis, near the government palace in downtown Beirut, Lebanon September 9, 2015. Lebanese security services locked down central Beirut on Wednesday as ministers and parliamentarians met to discuss ways out of a political crisis that has paralysed government and fueled a wave of street protests. REUTERS/Hasan Shaaban 

Revellers cool themselves in the Danube River during the Sziget music festival on an island in Budapest, Hungary August 12, 2015. A heatwave has hit Hungary with temperatures topping 38 degrees Celsius (100 degrees Fahrenheit). REUTERS/Laszlo Balogh 

A participant uses a water gun during a water fight in Tel Aviv, July 10, 2015. REUTERS/Baz Ratner 

People take part in a giant water fight on a hot summer day in central Brussels, Belgium, July 3, 2015. A widespread, long-lasting heatwave will affect much of France, Britain, Belgium, the Netherlands and western Germany. According to forecast, the temperature for Friday could reach 35 degrees Celsius (95 degrees Fahrenheit). REUTERS/Yves Herman 

Revellers participate in a water fight during Songkran Festival celebrations at Silom road in Bangkok April 13, 2015. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck. REUTERS/Athit Perawongmetha 

A police officer gets sprayed by water guns during the" WorldPride" gay pride Parade in Toronto, June 29, 2014. Toronto is hosting WorldPride, a week-long event that celebrates the lesbian, gay, bisexual and transgender (LGBT) community. REUTERS/Mark Blinch (CANADA - Tags: SOCIETY TPX IMAGES OF THE DAY) 

A boy scares other children with a watergun as they play in an alley in Dharavi, one of Asia's largest slums, in Mumbai May 28, 2014. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY) 

A participant dodges in the annual water-splashing festival to mark the New Year of the Dai minority in Xishuangbanna, Yunnan province April 15, 2014. Last Sunday marked the beginning of the 1,376th New Year, according to the ethnic Dai minority calendar. REUTERS/Wong Campion (CHINA - Tags: SOCIETY ANNIVERSARY) 

Revellers take part in a water fight during Songkran Festival celebrations on Silom Road in Bangkok April 14, 2014. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck.
REUTERS/Darren Whiteside (THAILAND - Tags: SOCIETY) 

A young reveller takes part in a water fight during Songkran Festival celebrations on Silom Road in Bangkok April 14, 2014. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck.
REUTERS/Darren Whiteside (THAILAND - Tags: SOCIETY) 

Revellers take part in a water fight during Songkran Festival celebrations on Silom Road in Bangkok, April 13, 2014. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck.
REUTERS/Darren Whiteside (THAILAND - Tags: SOCIETY) 

A policeman directs revellers at a water fight during Songkran Festival celebrations on Silom Road in Bangkok, April 13, 2014. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck.

REUTERS/Darren Whiteside (THAILAND - Tags: SOCIETY) 

A reveller uses a water gun as he participates in a water fight during Songkran Festival celebrations at Khaosan road in Bangkok, April 12, 2014. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck. REUTERS/Athit Perawongmetha (THAILAND - Tags: SOCIETY) 

A member of the Muslim Brotherhood and supporter of deposed Egyptian President Mohamed Mursi holds a water gun during a protest around Cairo University and Nahdet Misr Square where they are camping in Giza, south of Cairo August 11, 2013. Leaders of Mursi's Muslim Brotherhood mounted a stage at the site on Sunday to demand that he brought back to power. Egyptian police are expected to start taking action early on Monday against supporters of Mursi who are gathered in protest camps in Cairo, security and government sources said on Sunday, a move which could trigger more bloodshed. REUTERS/Mohamed Abd El Ghany (EGYPT - Tags: POLITICS CIVIL UNREST) 

Local residents participate in a water fight at People Square in Shanghai July 21, 2013. The temperature in Shanghai rose to 36 degrees Celsius (97 degrees Fahrenheit) on Sunday, reported local news. REUTERS/Carlos Barria (CHINA - Tags: SOCIETY ENVIRONMENT) 

A woman participates in a water fight at People Square in Shanghai July 21, 2013. The temperature in Shanghai rose to 36 degrees Celsius (97 degrees Fahrenheit) on Sunday, reported local news. REUTERS/Carlos Barria (CHINA - Tags: SOCIETY ENVIRONMENT) 

A boy looks at bubbles being sprayed from a water gun during the San Fermin festival's "Comparsa de gigantes y cabezudos" (Parade of the giants and the big heads) in Pamplona July 10, 2013. REUTERS/Susana Vera (SPAIN - Tags: SOCIETY)

ATTENTION EDITORS : SPANISH LAW REQUIRES THAT FACES OF MINORS ARE MASKED IN PUBLICATIONS WITHIN SPAIN 

People take part in a water fight on Rabin Square in Tel Aviv July 5, 2013. Thousands of people took part in the popular annual event. REUTERS/Nir Elias (ISRAEL - Tags: TRAVEL SOCIETY TPX IMAGES OF THE DAY) 

People take part in a water fight on Rabin Square in Tel Aviv July 5, 2013. Thousands of people took part in the popular annual event. REUTERS/Nir Elias (ISRAEL - Tags: TRAVEL SOCIETY) 

Lauren Wagner (L) of Baltimore, Maryland shoots her water gun as she helps lead a group of about twenty demonstrators with toy guns as they march in a 'Toy Gun March' demonstration, organized by a Libertarian website to highlight Second Amendment gun rights, from Arlington Cemetery into Washington, July 3, 2013. A different group has called off a proposed march with actual loaded firearms on the U.S. capital they had scheduled on the Independence Day holiday on Thursday. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS CIVIL UNREST) 

Austin Petersen of Alexandria, Virginia, leads a group of about twenty demonstrators carrying water guns toward the Washington Monument as they march in a 'Toy Gun March' demonstration, organized by a Libertarian website to highlight Second Amendment gun rights, from Arlington Cemetery into Washington, July 3, 2013. A different group has called off a proposed march with actual loaded firearms on the U.S. capital they had scheduled on the Independence Day holiday on Thursday. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS CIVIL UNREST) 

A reveller uses a water gun as he participates in a water fight during the Songkran Festival celebrations at Khaosan road in Bangkok April 13, 2013. The Songkran festival, also known as the water festival, marks the start of Thailand's traditional New Year and is believed to wash away bad luck. REUTERS/Damir Sagolj (THAILAND - Tags: SOCIETY TPX IMAGES OF THE DAY) 

A boy plays with a water pistol during Holi celebrations in a lane near the Bankey Bihari temple in Vrindavan in the northern Indian state of Uttar Pradesh March 25, 2013. Holi, also known as the Festival of Colours, heralds the beginning of spring and is celebrated all over India. REUTERS/Vivek Prakash (INDIA - Tags: RELIGION SOCIETY TPX IMAGES OF THE DAY) 

Catholic priest Humberto Alvarez sprays holy water from a water gun to bless a crucifix during mass at the Ojo de Agua church in Saltillo, in the northern state of Coahuila February 17, 2013. Alvarez wears robes with cartoon characters and uses a water gun to bless the congregation when conducting children's mass, but slips back into his regular robes when officiating mass for adult believers. REUTERS/Daniel Becerril (MEXICO - Tags: RELIGION SOCIETY) 

Revellers dance during the annual block party known as the "Suvaco do Cristo" (Armpit of Christ), one of the many pre-carnival parties to take place in the neighbourhoods of Rio de Janeiro February 3, 2013. REUTERS/ Ricardo Moraes (BRAZIL - Tags: SOCIETY)