It’s a prank by New York prank collective Improv Everywhere. People who agreed to join this prank enter a subway car at consecutive stops without their pants in the middle of winter. They pretend that they do not know each other and if someone asked why they don’t have pants, they simply say “they forgot” to put them on. No Pants Subway Ride first took place in 2002 with seven riders and has grown exponentially each year. In 2009 over 1,200 people participated in New York and over 1,000 more participated in 21 other cities around the world.
I don’t think I could ever join this because I hate being cold but if I do I will bring with me an electric blanket to warm me up afterwards.