Hundreds of commuters in London, Berlin and Prague took off their trousers to make a half-naked trip for the annual No Trousers On The Tube ride.
The event is part of the global No Pants Subway Ride, which began in New York in 2002 and has since expanded to more than 60 cities around the world.
In London, crowds met outside the National Gallery on Trafalgar Square before going underground where they boarded trains on various subway lines in the capital.
More than 100 people piled on the Piccadilly line, where they struggled to remove their pants because of the crowds.
Hundreds of London metro commuters took part in the 10th annual No Trousers On The Tube ride this afternoon
Regular sunday passengers were stunned when men and women in their brightly colored underwear were talking, reading and taking pictures of each other
Brave passengers ride on a Jubilee Line train while taking part in the event on Sunday afternoon
Another group posed at Canada Wharf and participated in the No Trousers On The Tube event
Regular Sunday passengers were stunned when men and women sat in their brightly colored underwear to talk, read, and take pictures of each other.
After they switched to the Jubilee Line in Green Park, the group got off at Canary Wharf to do some aerobics on the platform before jumping into another train.
Other groups left for landmarks in London, including one to parliament.
Sisters Tessa and Matilda Deterding said they came for the first time because they liked the idea behind it.
Some brave party-goers even stopped to pose half-naked as they traveled through the city
Multitudes piled on brightly colored underwear on various pipelines across the capital
The event is part of the global No Pants Subway Ride, which started in New York in 2002 and has since spread to more than 60 cities around the world
Youth without pants take part in the No Pants Subway Ride & # 39; in Prague, Czech Republic on Sunday
Tessa, 24, from London, said: & # 39; We read about it and thought it sounded hilarious. I was not nervous about it.
I like the sentiment behind it, instead of a stiff upper lip it is a bit of a laugh. & # 39;
Matilda (22) said: & # 39; I especially chose my pants, you have to choose a beautiful opaque.
Four young people are waiting to board a train with brightly colored underwear, sports shoes and jackets in Prague
Some even chose to face the challenge shoeless when they made their way through a subway station
A man in Berlin, Germany, opted for bright pink underwear covered with cartoon images of broccoli
& # 39; You do not want to give too much spectacle. & # 39;
Unrestrained party goers then went to the Chandos pub in Trafalger Square for an after party.
The London event was organized by the Stiff Upper Lip Society, which asked participants to avoid strings / budgie smugglers / all-round views as we strive to entertain amusing underground users.
The London event was organized by the Stiff Upper Lip Society, who asked participants to "strings / budgie smugglers / see-throughs". to avoid
A group of three women (left) sits in a circle line in their underwear while a young mother (right) is waiting on a platform with her son in London
One of the organizers, Farhan Rasheed, said that there was not really a goal for the event, it was just a little fun
Some participants in Germany dressed even more extensively in bright orange Lycra shirts with their pink hair
One of the organizers, Farhan Rasheed, said that there was not really a goal for the event, it was just a bit of fun.
He added: "It makes no sense, we do not campaign or we do not create awareness of anything.
"People just enjoy it, it's a bit of a nonsense day out.
People walk to a Jubilee Line train when they participate in the annual No Trousers On The Tube Day
Celebrators show off brightly colored underwear with a pattern while braying the tube on a cold winter's day
& # 39; You rarely get people who are insulted. It is London and London is used to it, they do everything to return to their book. & # 39;
The event also took place in Berlin and Prague on Sunday when dozens of passengers boarded the metro and half-dressed U-Bahn.
Some participants in Germany dressed even more extensively in bright orange Lycra shirts with their pink hair.
The No Pants Subway Ride would also have taken place this weekend in Chicago, New York City, Amsterdam and San Francisco.
A group of fearless friends laughed together as they left a subway station during the event
A jubilee line car filled with passengers without legs that read and take photos