No pants on the T. 

On Sunday, Bostonians 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 

Hundreds of pantless participants gathered at 1 Pemberton Square at 2 p.m. to ride the subway and partake in the silliness. 

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