New Yorkers thought it was a hot thing to strip to their underwear in winter — in public — along with pantless crowds in about 60 countries.

Twenty-four-year-old Miguel Ramos called himself a "no-pant virgin" in Sunday's No Pants Subway Ride. It was his first foray into the "international celebration of silliness," as organizers billed it.

The laughter-filled ritual started in New York in 2002.

It was coordinated by Improve Everywhere, a global flash mob. Participants were assigned personal numbers and told to show up at central gathering spots in each city borough. They then boarded subways, tearing their pants off on the tracks.

Whole New York families took part, including babies bared to their diapers.

Pantless riders also appeared in Atlanta, Chicago, Dallas, London and elsewhere.