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No Pants Subway Ride

People ride on a tube as they take part in the 11th annual No Trousers Tube Ride in London.

AP/PTI

A man climbs an escalator while transferring trains during the 18th annual No Pants Subway Ride, in New York.

AP Photo/Kathy Willens

Leon Feingold, left, and Patrizia Calvio wait for a train, minus their pants, at the West 4th Street Station during the 18th annual No Pants Subway Ride, in New York. The No Pants Subway Ride is an annual event staged by Improv Everywhere each January in New York City and other locations globally.

AP Photo/Kathy Willens

Two women pose for a photograph with a pair of New York City police officers at the Union Square station at the culmination of the 18th annual No Pants Subway Ride, in New York. .

AP Photo/Kathy Willens

Participants in the 18th annual No Pants Subway Ride transfer between trains at the 51st Street subway station in New York. The only two requirements are that participants be willing to take their pants off on the subway and are able to keep a straight face about it. The prank began in 2002 in New York but is now staged in multiple cities around the world.

AP Photo/Kathy Willens