A man taking part in the annual international "No Pants Subway Ride" day wait for the Jerusalem light train on January 7, 2018. All pics/AFP
The offbeat flashmob stunt originated in New York in 2002 but has since spread around the world
It was the third year running that it took place in generally-conservative Jerusalem
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
Participants in the annual International "No Pants Subway Ride" travel on a London underground train in London, on January 10, 2016
Started in 2002 with only seven participants, the day is now marked in over 60 cities around the world
A passenger takes photos of people riding a subway train without pants during the international 'No Pants Ride Day' in Warsaw on January 7, 2018
Once the participants board the train, they are supposed to play it straight and pretend as if nothing is out of the ordinary.