No Pants Subway Ride Day hits trains worldwide

If you’re riding the train today and see people without pants – don’t fret – you’re not seeing things.

This Sunday is the annual No Pants Subway Ride Day, which has spread to dozens of countries around the world.

The event was started by theater group Improv Everywhere 13 years ago in New York City, according to the Los Angeles Times, to celebrate peoples’ curiosity and to spread laughter.

On a Facebook page, Chicago’s No Pants organizers recommended people wear “granny panties, boxer briefs, and boy cut underwear,” WGN reports.

Marc Littman, a spokesman for the Los Angeles County Metropolitan Transportation Authority, said pantless riders who are otherwise fully clothed will not be cited for indecent exposure.

"If you're walking around naked, that's a different story,” he told the LA Times.