Tube passengers got a surprise on Sunday (January 12) when pranksters rode alongside them in their underwear.
In this footage, mischievous Londoners are seen taking part in 'No Trousers Tube Ride' 2020.
The stunt is in its 11th year and is part of Improv Everywhere's international 'No Pants Subway Ride' event which has its origins in New York.
Event organiser Ivan Markovic said: “At the end of the day we all try and just blend in and try to behave normally … we want to create a stir, we want to create an event in London, we want to make people smile.”