NEW YORK(CBSNewYork) — Temperatures have dipped outside but they may have gone up on the subway.

Sunday, was the annual “No Pants Subway Ride” when random passengers board subway cars at separate stops in the middle of winter without any pants on.

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The event was started in 2002 by the group “Improv Everywhere”.

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In 2013, over 4,000 people participated in the event.

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