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NEW YORK (PIX11) — It’s that time of year again! What started as a small prank turned into an annual international fad. That’s right — this weekend, No Pants Subway Ride 2014 kicks off.

The No Pants Subway Ride started 13 years ago in 2001 and is hosted by Improv Everywhere in January of every year.

RELATED: SEE photos from 2013 as NYC commuters strip down for the No Pants Subway Ride 

The “prank collective” says the phenomenon is happening now in 60 countries around the world — including Hong Kong, Buenos Aires, and Warsaw.

A straphanger sans pants enjoys the No Pants Subway Ride in 2013.

There’s only two rules — you must be “willing to take pants off on subway” and “able to keep a straight face about it.”

The event starts at 3 p.m. and ends at Union Square by 4 p.m.

For more information, see the event’s website.