People braved the cold in their underwear on subway trains around the world Sunday for the 13th annual No Pants Subway Ride.
There were only two requirements to participate: You had to be willing to take your pants off and you had to be able to keep a straight face about it.
The event was organized by the group Improv Everywhere.
The no pants subway ride started in the U.S. in 2002 as a prank.
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