Hundreds participate in the 8th annual No Trousers On The Tube Day in central London.
The No Trousers On The Tube Day began as a madcap idea in 2002, when seven men threw off their trousers and rode the New York subway for a prank.
The annual event is now celebrated in more than 60 countries around the world, with around 9,000-10,000 people take part in each year.
Organiser Ivan Markovic said: "We travel the Tube on the first Sunday of the year and just make a scene. We make people smile. We make people laugh and we get some lovely reactions."
However, participants had to make sure they were off the London Underground by 6pm because of the planned 24-hour Tube strike.
Copyright © 2018 CGTN. Beijing ICP prepared NO.16065310-3
Copyright © 2018 CGTN. Beijing ICP prepared NO.16065310-3