Every January since 2002, a group of brave participants in the Big Apple get together to perform one daring feat: Riding the subway sans pants.

Sunday The Improv Everywhere — which is described on its website as a group of thousands of “undercover agents” who “cause scenes of chaos and joy in public places” — rallied together close to 3,000 folks in their skivvies to parade through the tubes. The end of the road was Union Square, where the pantless wonders converged after braving the 28-degree chill.

Hundreds of people braved the sub-freezing temps, boarded the Red Line at Granville, disrobed, and eventually made their way down to the Roosevelt stop, where singing, dancing and pantsless frolicking ensued.

Improv Everywhere plans to have an official video out next week, but there’s already tons of videos, like this one, flooding the web as we speak.

New York, you DO know how to have fun!!!