Please report any suspicious packages! Thousands of exhibitionists strip down to their underwear to ride subways across the world

A woman shows her flexibility by doing the splits over the ticket barriers in Tower Bride, London

A woman at Stratford station wearing purple Doc Martens, a purple hat and a purple sweater poses for a picture in pants reading: 'Yes, Daddy?'

A woman draws looks from fellow passengers on the subway in Prague, Czech Republic on Sunday

A couple baring their legs read a newspaper on the train in Munich, while another girl in her pants checks her phone

Women bare their buttocks on the escalators at a Tube station in London which turns the head of a fellow rail user 

Four women laugh on the London Underground system wearing hats, scarves, and ditching their trousers

A fully-clothed woman slyly takes a photograph of participants of the event who are sitting in their pants on a Berlin subway

Four men in a line use the cashpoints wearing jackets but no trousers at Liverpool Street station in London

A couple make their way up the escalator at Liverpool Street station having disembarked the Tube

Two women check a phone wearing thick coats and scarves but not wearing any trousers

A man reads his magazine in his underwear as four young women ride the Tube in London

Passengers wear no trousers as they ride the Jerusalem's light train in Jerusalem, Israel,  on January 7 January

Passengers without pants step down the stairs in a subway station during the No Pants Subway Ride on January 7, 2018 in Prague

Passengers wait to get on the platform in Prague - many of them without their trousers on

A woman and a man climb the escalator in the middle of fully-clothed subway passengers 

A group of participants disembark at Liverpool Street Station in London earlier today

A man in a bobble hat and blue underwear makes her way up the escalator in Liverpool Street Station

A fully-clothed man looks slightly uncomfortable as he is surrounded by participants in Berlin, Germany 

Two women without their trousers make their way through the ticket barriers at a London Tube station

A group of participants make their way across the platform as the Tube to Brixton leaves 

Passengers take part in the No Pants Subway Ride in Prague, Czech Republic, today

this woman clearly did not get the memo about the No Pants Subway Ride, with only her nose, cheeks and mouth visible in Prague

A sea of bare legs at a train station in Prague, Czech Republic, on January 7, 2018

A woman steps onto the escalator at a station in Prague as fellow participants look down laughing

The participants make their way up the steps of a train station in Prague, Czech Republic, during the event

A man in jeans laughs with a woman in a leather jacket, a scarf and no trousers on a subway

Participants of the No Pants Subway Ride By Odlo ride a commuter train on January 7, 2018 in Berlin, Germany

Two passengers appear stunned as they share a carriage with participants baring their legs

A woman wearing a Wonder Woman t-shirt and matching pants walks through the barriers carrying a coffee

A man wearing a Cambridge University rugby Varsity hat sits next to a woman and a man in sunglasses on the Central Line in London 

A woman does not look too impressed by the dozens of passengers around her baring their legs

A group of participants stand on a platform as a train whizzes by in Jerusalem, Israel, which was part of the No Pants Subway Ride

A woman in red trainers and a bobble hat stands waiting for a tram in the city of Jerusalem