Subway riders drop their trousers for the annual No Pants Subway Ride
People in 60 countries rode transit systems in their underwear today
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Participants in the annual International "No Pants Subway Ride" wait at a station for a London underground train. Started in 2002 with only seven participants, the day is now marked in over 60 cities around the world.Leon Neal/AFP / Getty Images
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Participants in the No Pants Subway Ride DC, wait to ride the Metro in Washington, DC. The idea behind "No Pants" is that random passengers board a subway car at separate stops in the middle of winter, without wearing trousers.Andrew Caballero-Reynolds/AFP / Getty Images
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Participants in the annual International "No Pants Subway Ride" travel on a London underground train in London. The participants wear all of the usual winter clothing on their top half such as hats, scarves and gloves and do not acknowledge each other's similar state of undress.Leon Neal/AFP / Getty Images
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A man with no pants rides the subway during the annual No Pants Subway Ride in New York.Stephanie Keith/Reuters
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People with no pants ride the subway during the annual No Pants Subway Ride in New York.Stephanie Keith/Reuters
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People take part in the 'No Pants Subway Ride' in Vienna, Austria.HEINZ-PETER BADER/Reuters
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A New York City police officer stands guard during the annual No Pants Subway Ride in New York.Stephanie Keith/Reuters
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Two men in underpants, taking part in the "No Pants Subway Ride" event, wait for a train on a subway station in Warsaw, Poland.Alik Keplicz/The Associated Press
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Two girls react as people in underpants taking part in the 'No Pants Subway Ride" event stand next to them in an underground train car in Warsaw, Poland.Alik Keplicz/The Associated Press
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The doors of a subway train open revealing pantless riders in colourful underwear during the 15th annual No Pants Subway Ride in New York.Kathy Willens/The Associated Press