Professional prankster group Improv Everywhere’s “No Pants Subway Ride” is one cultural trend that appears to be taking off. Despite a frigid winter, participants in as many as 43 cities around the world commuted in their underwear, and we’ve got photos to prove it.

But why drop trou on the train? In the words of one participant, quoted by the BBC, “We’re just trying to put smiles on people’s faces.” As we say goodbye to a bummer of a decade, their timing couldn’t be better.

New York (photo by SpecialKRB):

Zürich:

Mall of America / Twin Cities:

Mexico City:

Vienna:

Warsaw:

Vancouver:

Stockholm:

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