Commuters strip down to their undergarments to participate in the

The yearly prank, organized by New York City based prank collective "Improv Everywhere" was started in 2002, asking participants to ride subway lines trouser free and act straight faced about it.

London Underground Users Strip Down To Their Undies For 'No Trousers Tube Ride' - Network Ten

No Pants Subway Ride' kicks off with train commuters around the world stripping off

Thousands of commuters strip off for No Pants Subway Ride

Commuters strip down to their undergarments to participate in the annual No Pants Subway Ride - India Today

No Pants Subway Ride 2020 has straphangers stripping to undies in front of women and kids – The US Sun

No Pants Subway Ride 2016: London commuters strip down to underwear in international celebration of silliness - Mirror Online

London commuters walk around in their underwear during 'No Trousers Day

Londoners strip off for annual 'No Trousers Tube Ride

Commuters in New York, Boston and London strip down to underwear for No Pants Subway Ride