Hundreds of runners dressed in Santa outfits compete during a charity Santa run in Shanghai, China, November 29, 2015. (Photo by Aly Song/Reuters)





Runners dressed in Santa outfits take selfies before a charity Santa run in Shanghai, China, November 29, 2015. (Photo by Aly Song/Reuters)





Runners dressed in Christmas-themed outfits compete during a charity Santa run in Shanghai, China, November 29, 2015. (Photo by Aly Song/Reuters)





Runners dressed in Santa outfits compete during a charity Santa run in Shanghai, China, November 29, 2015. (Photo by Aly Song/Reuters)





People dressed in Santa costumes take part in the Santa Claus Run in Athens, Greece, November 29, 2015. (Photo by Alkis Konstantinidis/Reuters)





People dressed in Santa costumes take a "selfie" in front of the parliament building as they take part in the Santa Claus Run in Athens, Greece, November 29, 2015. (Photo by Alkis Konstantinidis/Reuters)





People dressed in Santa costumes take part in the Santa Claus Run in Athens, Greece, November 29, 2015. (Photo by Alkis Konstantinidis/Reuters)





A person dressed in a Santa costume runs next to another in a wheelchair as they go past the parliament building during the Santa Claus Run in Athens, Greece, November 29, 2015. (Photo by Alkis Konstantinidis/Reuters)