People without their pants take part in the worldwide "No Pants Subway Ride" on a subway train in London, Britain, on January 13, 2013. (Xinhua/Bimal Gautam)
People without their pants take part in the worldwide "No Pants Subway Ride" on a subway train in London, Britain, on January 13, 2013. (Xinhua/Bimal Gautam)
A man without pants takes part in the worldwide "No Pants Subway Ride" on a subway train in London, Britain, on January 13, 2013. (Xinhua/Bimal Gautam)
Participants take part in the No Pants Subway Ride in New York, the United States, on January 13, 2013. (Xinhua/Wang Lei)
Participants take part in the No Pants Subway Ride in New York, the United States, on January 13, 2013. (Xinhua/Wang Lei)
Participants take part in the No Pants Subway Ride in New York, the United States, on January 13, 2013. (Xinhua/Wang Lei)
Participants take part in the No Pants Subway Ride in New York, the United States, on January 13, 2013. (Xinhua/Wang Lei)
Participants take part in the No Pants Subway Ride in New York, the United States, on January 13, 2013. (Xinhua/Wang Lei)
Participants take part in the No Pants Subway Ride in New York, the United States, on January 13, 2013. (Xinhua/Wang Lei)
Participants take part in the No Pants Subway Ride in New York, the United States, on January 13, 2013. (Xinhua/Wang Lei)
People without their pants take part in the annual "No Pants Subway Ride" in Sao Paulo, Brazil, on January 13, 2013. (Xinhua/Rahel Patrasso)
People take off their pants as they take part in the annual "No Pants Subway Ride" in Sao Paulo, Brazil, on January 13, 2013. (Xinhua/Rahel Patrasso)
People take off their pants on a subway platform as they take part in the annual "No Pants Subway Ride" in Sao Paulo, Brazil, on January 13, 2013. (Xinhua/Rahel Patrasso)
People without their pants take part in the annual "No Pants Subway Ride" in Sao Paulo, Brazil, on January 13, 2013. (Xinhua/Rahel Patrasso)
People without their pants take part in the worldwide "No Pants Subway Ride" event at a subway station in Mexico City, capital of Mexico, on January 13, 2013. (Xinhua/Pedro Mera)
A man without pants takes part in the worldwide "No Pants Subway Ride" event at a subway station in Mexico City, capital of Mexico, on January 13, 2013. (Xinhua/Pedro Mera)
People without their pants take part in the worldwide "No Pants Subway Ride" event at a subway station in Mexico City, capital of Mexico, on January 13, 2013. (Xinhua/Pedro Mera)
A woman without pants takes part in the worldwide "No Pants Subway Ride" event at a subway station in Mexico City, capital of Mexico, on January 13, 2013. (Xinhua/Pedro Mera)
A man without pants takes part in the worldwide "No Pants Subway Ride" event at a subway station in Mexico City, capital of Mexico, on January 13, 2013. (Xinhua/Pedro Mera)
People without their pants take part in the worldwide "No Pants Subway Ride" event in a subway train in Mexico City, capital of Mexico, on January 13, 2013. (Xinhua/Pedro Mera)