A participant readies herself during the 2012 No Pants Subway Ride in New York.

Participants of 'A Day Without Pants' event ride the subway in Mexico City. The event was organized by Flashmob Mexico.

Participants gather in the Union Square subway station during the annual No Pants Subway Ride.

Some riders in the New York City subway in the underwear as the take part in the 2012 No Pants Subway Ride.

Participants of the ‘A Day Without Pants’ event climb the stairways at a subway station in Mexico City.

A woman and a child take part in the ‘A Day Without Pants’ event at the subway in Mexico City.

Participants wait for their train during the annual No Pants Subway Ride.

Some riders wait for the subway in the underwear as the take part in the 2012 No Pants Subway Ride.

To maintain the surreal atmosphere, the pantsless commuters were instructed to chat, read and listen to music like they normally would have if clothed.

Some riders in the New York City subway in the underwear as the take part in the 2012 No Pants Subway Ride.