No trousers Tube ride 2016: Londoners to strip down to their pants this Sunday for annual No Pants Subway Ride

Over 300 Londoners surprised passengers last year by getting their legs out for the event

No Pants Day flash mob is the event organized by Improv Everywhere and takes place in many cities across the world

Are you willing to take your trousers off on the Tube? And – more importantly – are you able to keep a straight face about it?

These are the two main requirements for people wishing to take part in this Sunday’s event in which Londoners ditch their trousers and waltz onto the London Underground with bare legs.

Known globally as the No Pants Subway Ride, but in the UK as the No Trousers Tube Ride, this now-annual event will see participants gathering at 3pm in a central location before removing their trousers, travelling the Tube and eventually making it to the pub, all in the name of fun.

The event was originally started by Improv Everywhere in New York. The organisers say the mission “started as a small prank with seven guys and has grown into an international celebration of silliness, with dozens of cities around the world participating each year.”

“The idea behind No Pants [trousers in the UK] is simple: Random passengers board a subway car at separate stops in the middle of winter without pants. The participants behave as if they do not know each other, and they all wear winter coats, hats, scarves, and gloves. The only unusual thing is their lack of pants.”

Last year trouserless travellers boarded underground trains in London, New York, Mexico City, Buenos Aires, Istanbul, Shanghai and Hong Kong as events took place in over 60 cities in more than 25 countries.