'' No Pants Subway Ride '' Sunday Jan 12,2014

No Pants Subway Ride is an annual event in which transit passengers ride trains without wearing pants organized by Improv Everywhere and observed in dozens of cities worldwide

Started in 2002 with only seven participants, the day is now marked in over 60 cities around the world

The premise is simple: participants convene on a given transport route on a designated day every year without trousers on, and ride the rails (or road) for shock value and laughs.

The idea behind 'No Pants' is that random passengers board a subway car at separate stops in the middle of winter, without wearing trousers. The participants wear all of the usual winter clothing on their top half such as hats, scarves and gloves and do not acknowledge each other's similar state of undress. 

Improv Everywhere expects some 4,000 participants in this year's New York event, with more than 60 other cities taking part 

Participants in the13th annual International “No Pants Subway Ride” wait for trains at a London underground station in London, on January 12, 2014.

People taking part in the “No Pants Subway Ride” are seen on the platform at the Potsdamer Platz station on the U2 Subway line in Berlin on January 12, 2014

 People taking part in the “No Pants Subway Ride” enter a metro station in Washington on January 12, 2014