People stands on the platform in a subway station during the 'No Pants Subway Ride' on January 7, 2018 in Munich, southern Germany. People stands on the platform in a subway station during the 'No Pants Subway Ride' on January 7, 2018 in Munich, southern Germany. No Pants Day participants in Munich, Germany wait to board the subway. (Photo: ANDREAS GEBERT/AFP/Getty Images)

Look Mom, no pants! Thousands celebrate on subways around the world

From England to Prague to Israel to Philly, annual tradition has throngs of commuters going trouser-less.

It's January, the coldest time of the year for a large part of the world. So what better way to ring in this frigid month than to go pants-less on the subway?

Yeah. We're confused too. But for folks in 60 cities around the world including New York City, Berlin, Prague, London, Jerusalem and Warsaw, Poland, International No Pants Subway Ride Day was apparently a no-brainer. Just strip down to your skivvies and take a ride. Bystanders be damned!

Participants in the 17th Annual 'No Pants Subway Ride' wait for a New York City subway train on January 7, 2018 in New York. The 'No Pants Subway Ride' is an annual event started in 2002 by Improv Everywhere in New York, the goal of which is for riders ri Did we forget something? (Photo: TIMOTHY A. CLARY/AFP/Getty Images)

The idea was born in 2002 as a flash mob-style stunt by the Improv Everywhere comedy collective and took off from there. It's always at 3 p.m. local time, and it's always in January – which means it's almost always a cold day for these leg-baring pranksters.

People take part in the No Pants Subway Ride braving freezing temperatures as others are seen covered for cold weather on January 7, 2018 in New York City. The annual event, in which participants board a subway car in January while not wearing any pants, The temperature in New York City at 3 p.m. Sunday was about -8°. (Photo: Eduardo Munoz Alvarez/Getty Images)

Passengers without pants pose for photographers prior to attend the 'No Pants Subway Ride' on January 7, 2018 in Jerusalem Israel. It was a high of 52 degrees on Jan. 7 in Jerusalem. (Photo: AHMAD GHARABLI/AFP/Getty Images)

These passengers often attract some undue attention because they're supposed to perform this silly feat with a straight face. It's all in the name of comedy.

Passengers without pants pose for photographers prior to attend the 'No Pants Subway Ride' on January 7, 2018 in Prague. In Prague, a group of passengers got together for a group photo before riding the subway. (Photo: MICHAL CIZEK/AFP/Getty Images)

Participants of the No Pants Subway Ride By Odlo ride a commuter train on January 7, 2018 in Berlin, Germany. The annual event, in which participants board a subway car in January while not wearing any pants. It's just business as usual in Berlin on a Sunday afternoon. Except if you look down. (Photo: Carsten Koall/Getty Images)

People take part in the annual 'No Trousers On The Tube Day' (No Pants Subway Ride) at Liverpool Street Station in London on January 7, 2018. Started in 2002 with only seven participants, the day is now marked in over 60 cities around the world. In London, the event is known as the No Trousers on the Tube Ride. (Photo: BEN STANSALL/AFP/Getty Images)

People taking part in the annual international 'No Pants Subway Ride' day travel on the Jerusalem light train on January 7, 2018. The offbeat flashmob stunt originated in New York in 2002 but has since spread around the world. The Jerusalem light train was a hotbed for distraction. And yes, we're talking about the Batman socks. (Photo: AHMAD GHARABLI/AFP/Getty Images)

The event is similar to, but not to be confused with, International No Pants Day. That one falls every year in May, when baring your legs makes a little more sense. Also, riding on the subway is optional.

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