More pictures .. 13th annual No Pants Subway Ride.
Straphangers in 60 cities around the world stripped down to their underwear Sunday for the 13th annual No Pants Subway Ride.
Improv Everywhere started the naked tradition in 2002 when seven men ditched their pants on the New York City subway. The event has grown to include more than 4,000 participants in cities from Beijing to Buenos Aires.
More pictures .. 13th annual No Pants Subway Ride.