In sub-freezing temperatures, several dozen participants descended the steps of the Broad Street Subway at City Hall Sunday for Philadelphia’s 8th annual No Pants Subway Ride.

This year’s ride, sponsored by the Philadelphia-based laundry service Got Laundry, combined silliness with a charity clothing drive.

After traveling two stops on the southbound Broad Street Line participants began removing their pants, taking selfies, and dancing in the aisle.

At AT&T station on South Broad Street, the celebration continued on the subway platform until the northbound train arrived for the trip back to City Hall. There, riders transferred to the Market Frankford Line.

The pranksters finished off the day with a party at Lucha Cartel in Old City.

The No Pants Subway Ride originated in 2002 in New York City with seven participants from the comedy collective Improv Everywhere. Since then, it has spread to more than 60 cities around the world including London, Paris, Berlin, and Shanghai.