New York City might be experiencing its worst winter in many years, but this didn’t stop residents from participating in their annual “no pants subway ride”, even at minus eight degrees Celsius. All done in the spirit of improv and silliness.

And so, on January 7 over 4,000 regular commuters of the NYC subway rode the trains without wearing any pants. The idea is to behave nonchalant as though this is nothing out of the ordinary. A comedy group called Improv Everywhere spearheaded this tradition back in 2002 with merely six people. They say their goal is to cause “scenes of chaos and joy in public places”.

As this trend catches on, riders around the world have come out without pants in solidarity to this act. Here are videos from Prague, Toronto and Berlin.