Large numbers of pantless commuters traversed the New York City (and London, Mexico City, Hong Kong, etc.) subway system on Sunday for the annual "No Pants Subway Ride."

The annual tradition was started 12 years ago in NYC by comedy group Improv Everywhere, and each year has seen more people partake in the bizarre event in subway systems around the world.

Check out the pics and let us know if this is something you would ever do.