No pants in Philly today.

On Sunday, Philly participated in the annual No Pants Subway Ride. The event, created by Improv Everywhere, started 15 years ago as a prank with seven guys riding the subway without wearing pants.  Since then, it has become an internationally celebrated event. 

RELATED: All you need to know about this Sunday’s No Pants Subway Ride 

Participants gathered at the courtyard of the Municipal Services Building, located at 1401 John F Kennedy Blvd to ride the subway and partake in the silliness. 

Check out some of the action from this year's No Pants Subway Ride in Philly.