Thousands of commuters across several cities in the United States and other leading cities in the world stripped down to their underwear to celebrate the 19th edition of No Pants Subway event

The "No Pants Subway Ride" is an annual event started in 2002 by Improv Everywhere in New York, according to the event's website, "The idea behind No Pants is simple: Random passengers board a subway car at separate stops in the middle of winter without pants."

The participants behave as if they do not know each other, and they all wear winter coats, hats, scarves, and gloves. The only unusual thing is their lack of pants.

In picture: Participants in the 19th Annual "No Pants Subway Ride" wait to board a train in the subway on January 12, 2020 in New York

Bostonians in their underwear parade down Boylston Street after getting off of the subway at Copley Square during the annual No Pants Subway Ride in Boston, Massachusetts on January 12, 2020.

Participants in New York City ride to different areas throughout the city before ending up in Union Square and commemorating the shared experience with an after-party at Bar 13.

Participants in the 19th Annual "No Pants Subway Ride" stripped down to their underwears, wait to board a train in the subway on January 12, 2020, in New York.

On a lighter note, the aim of participants is to travel around town with just tighty-whities and lingerie on their lower halves in an effort to help people banish their January blues.