PICS: NO PANTS! People in NY, London and other cities take bizarre 'no trousers subway ride'

This image is from New York where a man rides the F subway line. It was the 18th annual No Pants subway ride on January 13, 2019 in New York City. (Photo by David 'Dee' Delgado/Getty Images)

In a bizarre event, hundreds of commuters in London, New York, Berlin and Prague dropped off their pants to take a semi-naked subway trip on January 13, 2019. (Photo by Alberto Pezzali/NurPhoto via Getty Images)

24 cities participate in the annual event arranged by Improv Everywhere a New York city based comedy collective. (Photo by Alberto Pezzali/NurPhoto via Getty Images)

The event is part of worldwide “ No Pants On The Tube ride”, which was first started in New York in the year 2002 and has spread rapidly to more than 60 cities across the globe. (Photo by Alberto Pezzali/NurPhoto via Getty Images)

The peculiar event requires wearing full clothes on the upper part of the body, while just underpants for the bottoms, and making an appearance in public (especially in the underground train lines). (Photo by Alberto Pezzali/NurPhoto via Getty Images)

A huge crowd gathered outside the National Gallery in Trafalgar Square in London and then headed for underground trains on different Tube lines across the capital. (Photo by Alberto Pezzali/NurPhoto via Getty Images)