Subway riders from all over the world rode local trains on Sunday without any pants and San Diego was no exception.
The No Pants Subway Ride has been around for a decade, but according to the group's Facebook page this was the second annual event in San Diego.
Riders gathered at the 12th and Imperial trolley station, just before 3:00 p.m. The group's page had more than 200 people signed up to take part in the ride.
There were only two requirements for this event: ride the subway without pants and keep a straight face.
According to the website for Improv Everywhere, the goal is to "cause scenes of chaos and joy in public places." Their mission to get as many people as possible to ride the subway with no pants on has turned into an international celebration of silliness.
What started as a small prank with just seven guys riding the subway without pants on evolved into more than 5,000 "pants-less" people riding subways in 44 cities around the world, according to the website.