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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. 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. AFP PHOTO / LEON NEAL / AFP / LEON NEAL (Photo credit should read LEON NEAL/AFP via Getty Images)

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. 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.   AFP PHOTO / LEON NEAL / AFP / LEON NEAL        (Photo credit should read LEON NEAL/AFP via Getty Images)