Canada's Prime Minister Justin Trudeau (R) shares a laugh with Calgary Mayor Naheed Nenshi in Calgary, Alberta, Canada December 21, 2016. REUTERS/Todd Korol 

Canadian Prime Minister Justin Trudeau visits the site of the Universite de Montreal's new Science Complex in Montreal, December 16, 2016. REUTERS/Christinne Muschi 

Britain Football Soccer - West Ham United v Burnley - Premier League - London Stadium - 14/12/16 West Ham United manager Slaven Bilic and Burnley manager Sean Dyche Reuters / Eddie Keogh Livepic EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

Football Soccer Britain - Liverpool v West Ham United - Premier League - Anfield - 11/12/16 Liverpool manager Juergen Klopp and West Ham United manager Slaven Bilic embrace before the match Action Images via Reuters / Lee Smith Livepic EDITORIAL USE ONLY. No use with unauthorized audio, video, data, fixture lists, club/league logos or "live" services. Online in-match use limited to 45 images, no video emulation. No use in betting, games or single club/league/player publications. Please contact your account representative for further details. 

Britain Boxing - Anthony Joshua & Eric Molina Head-to-Head Press Conference - Radisson Hotel, Manchester - 8/12/16 Anthony Joshua during the press conference Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain Boxing - Anthony Joshua & Eric Molina Head-to-Head Press Conference - Radisson Hotel, Manchester - 8/12/16 Anthony Joshua during the press conference Action Images via Reuters / Andrew Couldridge Livepic EDITORIAL USE ONLY. 

Britain's Prince Charles (L) laughs with Mark Carney, the Governor of the Bank of England whilst being shown his office during a visit to the Bank in London, December 7, 2016. REUTERS/Kirsty Wigglesworth/Pool 

Britain's Prince Charles (R) laughs as he sits for a meeting with the Governor of The Bank of England Mark Carney during a visit to the Bank in London, December 7, 2016. REUTERS/Kirsty Wigglesworth/Pool 

Former Canadian Prime Minister Brian Mulroney (R) shares a laugh with his wife Mila (C) and Prime Minister Justin Trudeau after Mulroney received the rank of Commander in the French Legion of Honour during a ceremony at the French embassy in Ottawa, Ontario, Canada, December 6, 2016. REUTERS/Chris Wattie 

Gigi Hadid, winner of the International Model award poses for photographers at the Fashion Awards 2016 in London, Britain December 5, 2016. REUTERS/Neil Hall 

French Finance Minister Michel Sapin shares a laugh with European Economic and Financial Affairs Commissioner Pierre Moscovici (R) during a euro zone finance ministers meeting in Brussels, Belgium December 5, 2016. REUTERS/Francois Lenoir 

French Finance Minister Michel Sapin shares a laugh with European Economic and Financial Affairs Commissioner Pierre Moscovici (R) during a euro zone finance ministers meeting in Brussels, Belgium December 5, 2016. REUTERS/Francois Lenoir 

Director Lee Daniels (L) laughs while actor Gabourey Sidibe speaks during a ceremony honoring him with a star on the Hollywood Walk of Fame in Los Angeles, December 2, 2016. REUTERS/Danny Moloshok 

Director Lee Daniels (L) cries while actor Gabourey Sidibe speaks during a ceremony honoring him with a star on the Hollywood Walk of Fame in Los Angeles, December 2, 2016. REUTERS/Danny Moloshok 

Britain's Prince Harry laughs as he speaks with military service members during an official visit of Georgetown, Guyana December 2, 2016. REUTERS/Carlo Allegri 

First Lady Michelle Obama (C) embraces host Eva Longoria (L) as daughter Sasha joins them for a concluding Christmas carol at the 94th Annual National Christmas Tree Lighting ceremony on The Ellipse, near the White House, in Washington, U.S., December 1, 2016. REUTERS/Mike Theiler 

Leonardo-Finmeccanica CEO Mauro Moretti chats with ENI CEO Claudio Descalzi (L) during the Rome MED Mediterranean Dialogues forum in Rome, Italy December 1, 2016. REUTERS/Alessandro Bianchi 

U.S. President Barack Obama and First Lady Michelle Obama serve Thanksgiving dinner to residents of the Armed Forces Retirement Home (AFRH) in Washington, U.S., November 23, 2016. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

Supporters of U.S. President Elect Donald Trump, Tom and Barbara Bechler of Palos Verdes, California, stand in the lobby of Trump Tower in the Manhattan borough of New York City, U.S., November 17, 2016. REUTERS/Mike Segar 

U.S. House Majority Leader Kevin McCarthy (R-CA) laughs as he and House Speaker Paul Ryan, flanked by House Republican Whip Steve Scalise (R-LA), introduce Representative Jason Smith (R-MO) and Representative Luke Messer (R-IN) as new members of the House Republican leadership team after their caucus held leadership elections on Capitol Hill in Washington, U.S. November 15, 2016. REUTERS/Jonathan Ernst 

'Actors Dwayne Johnson (L) and Auli'i Cravalho (R) laugh at the world premiere of Walt Disney Animation Studios' "Moana" as a part of AFI Fest in Hollywood, California, U.S., November 14, 2016. REUTERS/Danny Moloshok 

Britain Soccer Football - Bradford City v Rochdale - Sky Bet League One - Northern Commercials Stadium, Valley Parade - 12/11/16 Rochdale Manager Keith Hill Mandatory Credit: Action Images / Craig Brough Livepic EDITORIAL USE ONLY. 

Football Soccer - Brazil's national team training - World Cup 2018 Qualifiers - Mineirao Stadium, Belo Horizonte, Brazil - 9/11/16 - Brazil's players Neymar and Marcelo attend a training session. REUTERS/Ricardo Moraes 

Football Soccer - Brazil's national team training - World Cup 2018 Qualifiers - Mineirao Stadium, Belo Horizonte, Brazil - 9/11/16 - Brazil's player Neymar attends a training session. REUTERS/Ricardo Moraes 

Football Soccer - Brazil's national team training - World Cup 2018 Qualifiers - Mineirao Stadium, Belo Horizonte, Brazil - 9/11/16 - Brazil's players Douglas Costa, Philippe Coutinho, and Filipe Luis joke before a training session. REUTERS/Ricardo Moraes 

U.S. Democratic presidential nominee Hillary Clinton and her husband, former U.S. President Bill Clinton, talk to reporters on her campaign plane in Philadelphia, Pennsylvania, U.S. November 7, 2016, the final day of campaigning before the election. REUTERS/Brian Snyder

U.S. Democratic presidential nominee Hillary Clinton and her husband, former U.S. President Bill Clinton, talk to reporters on her campaign plane in Philadelphia, Pennsylvania, U.S. November 7, 2016, the final day of campaigning before the election. REUTERS/Brian Snyder

U.S. Democratic presidential nominee Hillary Clinton and her husband, former U.S. President Bill Clinton, talk to reporters on her campaign plane in Philadelphia, Pennsylvania, U.S. November 7, 2016, the final day of campaigning before the election. REUTERS/Brian Snyder TPX IMAGES OF THE DAY

U.S. Democratic presidential nominee Hillary Clinton and her husband, former U.S. President Bill Clinton, talk to reporters on her campaign plane in Philadelphia, Pennsylvania, U.S. November 7, 2016, the final day of campaigning before the election. REUTERS/Brian Snyder TPX IMAGES OF THE DAY

NBA basketball player Lebron James (R) introduces U.S. Democratic presidential nominee Hillary Clinton during a campaign rally in Cleveland Ohio U.S., November 6, 2016. REUTERS/Carlos Barria 

NBA basketball player Lebron James (R) introduces U.S. Democratic presidential nominee Hillary Clinton during a campaign rally in Cleveland, Ohio, U.S., November 6, 2016. REUTERS/Carlos Barria TPX IMAGES OF THE DAY

U.S. President Barack Obama participates in a "Get Out the Early Vote" campaign event for Hillary Clinton in Columbus, Ohio, U.S. November 1, 2016. REUTERS/Jonathan Ernst 

Actor Brie Larson (L) presents actor Samuel L. Jackson (R) with the Albert R. Broccoli Britannia Award for Worldwide Contribution to Entertainment at the British Academy of Film and Television Arts (BAFTA) Los Angeles' Britannia Awards in Beverly Hills, California, October 28, 2016. REUTERS/Danny Moloshok 

Actor Brie Larson (L) presents actor Samuel L. Jackson (R) with the Albert R. Broccoli Britannia Award for Worldwide Contribution to Entertainment at the British Academy of Film and Television Arts (BAFTA) Los Angeles' Britannia Awards in Beverly Hills, California, October 28, 2016. REUTERS/Danny Moloshok TPX IMAGES OF THE DAY

Democratic U.S. presidential nominee Hillary Clinton greets supporters during a campaign rally in Lake Worth, Florida, U.S. October 26, 2016. REUTERS/Carlos Barria 

U.S. President Barack Obama laughs as he is interviewed by Jimmy Kimmel in a taping of the Jimmy Kimmel Live! show in Los Angeles October 24, 2016. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY

Democratic U.S. presidential nominee Hillary Clinton reacts as she attends a campaign rally at Alumni Hall Courtyard, Saint Anselm College in Manchester, New Hampshire U.S., October 24, 2016. REUTERS/Carlos Barria 

Democratic U.S. presidential nominee Hillary Clinton reacts as she attends a campaign rally at Alumni Hall Courtyard, Saint Anselm College in Manchester, New Hampshire U.S., October 24, 2016. REUTERS/Carlos Barria 

Jordan's Prince Ali Bin Al Hussein (L), president of the Jordanian Football Association, laughs with Reuters journalist Suleiman al-Khalidi after the end of the interview, in Amman, Jordan, October 23, 2016. Picture taken October 23, 2016. To match Interview SOCCER-FIFA/PRINCE ALI REUTERS/Muhammad Hamed 

Actors Cobie Smulders, Danika Yarosh and Tom Cruise arrive for the German premiere of the film "Jack Reacher: Never Go Back" in Berlin, Germany, October 21, 2016. REUTERS/Hannibal Hanschke TPX IMAGES OF THE DAY

Democratic U.S. presidential nominee Hillary Clinton (L-R), Archbishop of New York Cardinal Timothy Dolan and Republican U.S. presidential nominee Donald Trump sit together at the Alfred E. Smith Memorial Foundation dinner in New York, U.S. October 20, 2016. REUTERS/Jonathan Ernst 

Henry Paulson, the former Treasury secretary of US (L) and Chinese Premier Li Keqiang are laughing before the meeting at the Diaoyutai State Guesthouse in Beijing, China October 20, 2016. REUTERS/Kenzaburo Fukuhara/Pool 

A woman laughs as a Haitian national police officer keeps people away during a distribution of supplies after Hurricane Matthew in Torbeck, Haiti, October 19, 2016. REUTERS/Andres Martinez Casares 

Women laugh after getting a bag with supplies during a distribution after Hurricane Matthew in Torbeck, Haiti, October 19, 2016. REUTERS/Andres Martinez Casares 

A woman laughs after getting a bag with supplies during a distribution after Hurricane Matthew in Torbeck, Haiti, October 19, 2016. REUTERS/Andres Martinez Casares 

U.S. President Barack Obama and Italy's Prime Minister Matteo Renzi (L) take part in an official arrival ceremony on the South Lawn of the White House in Washington, U.S., October 18, 2016. REUTERS/Kevin Lamarque

Britain Football Soccer - Derby County v Leeds United - Sky Bet Championship - iPro Stadium - 15/10/16
Derby manager Steve McClaren with Leeds' Pontus Jansson
Mandatory Credit: Action Images / Alan Walter
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U.N. Secretary-General-designate, Mr. Antonio Guterres of Portugal, laughs at a joke told by Samantha Power, U.S. Ambassador to the U.N., in front of the U.N. General Assembly at U.N. headquarters in New York, U.S. October 13, 2016. REUTERS/Lucas Jackson

U.S. Democratic presidential nominee Hillary Clinton (R) arrives to greet people at Tacos El Gordo in Las Vegas, Nevada, U.S. October 12, 2016. REUTERS/Lucy Nicholson 

Netherlands' Queen Maxima laughs as she attends a news conference at the Olivos presidential residence in Buenos Aires, Argentina October 12, 2016. REUTERS/Enrique Marcarian 

Britain Golf - British Masters - The Grove, Hertfordshire - 12/10/16
Piers Morgan and Richard Bevan share a joke during the Pro-Am
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Football Soccer Britain - Wales Training - Cardiff City Stadium, Cardiff, Wales - 8/10/16
Wales' Chris Gunter during training
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Football Soccer Britain - Wales Training - Cardiff City Stadium, Cardiff, Wales - 8/10/16
Wales' Chris Gunter during training
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Britain Football Soccer- Wales Press Conference - The Vale Resort, Hensol, Vale of Glamorgan, Wales - 4/10/16
Wales' Andy King during the press conference
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U.S. Democratic presidential nominee Hillary Clinton laughs on board her campaign plane in White Plains, New York, United States October 2, 2016. REUTERS/Brian Snyder

U.S. Democratic presidential nominee Hillary Clinton laughs with senior policy advisor Maya Harris (L) and traveling press secretary Nick Merrill (R) on board her campaign plane in White Plains, New York, United States October 2, 2016. REUTERS/Brian Snyder

Britain Soccer Football - Sunderland v West Bromwich Albion - Premier League - The Stadium of Light - 1/10/16
West Bromwich Albion manager Tony Pulis and Sunderland manager David Moyes before the match
Action Images via Reuters / Lee Smith
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Britain Soccer Football - Sunderland v West Bromwich Albion - Premier League - The Stadium of Light - 1/10/16
West Bromwich Albion manager Tony Pulis and Sunderland manager David Moyes before the match
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Britain's Prince William and Catherine, Duchess of Cambridge, react during during a story with children at the MacBride Museum in Whitehorse, Yukon, Canada, September 28, 2016. REUTERS/Chris Wattie 

Britain's Catherine, Duchess of Cambridge, reacts while sampling food during the Taste of British Columbia event at Mission Hill winery in Kelowna, British Columbia, Canada, September 27, 2016. REUTERS/Chris Wattie