Mass transit users worldwide are getting ready to be a little cheeky on Jan. 8, when the 11th Annual No Pants Subway Ride will take over the subway systems globally. Over 57 cities have promised to join the trouser-free commute, including Mexico City, London and Tel Aviv.

The event was started over a decade ago by Improv Everywhere, a New York City-based collective with the motto We Cause Scenes. The first appearance of the no pants ride dropped many unsuspecting jaws when it began in New York City, but at this point has become more of a rite of passage for neo-New Yorkers and folks who enjoy flashing a bit of skin.

The rules are fairly simple. Get on the your respective subway and take your pants off and enjoy the rest of the trip. (One could, always, just leave their pants at home, but it's not recommended in the dead of winter). Folks are otherwise encouraged to wear a normal getup, shoes, socks, shirts, coats, hats, gloves and scarves. Just no pants. Sorry fellas, thongs and g-strings are a no go.

As of writing, over 5,000 folks worldwide have promised to attend via the event's Facebook page. Not sure if you city is on the list? Check it out here.

Participants are asked to post tweets or pics of their commute with the hashtag #NPSR and @improvevery, and are encouraged to RSVP on Facebook.

Check out video of last year' festivities below.