January 11, 2002 (November 28, 2001 in the lunar calendar) is World Subway No Pants Day. Passengers riding the subway without pants in Berlin, Germany The annual "Subway No Pants Day" has once again swept the world. People in many cities around the world, including New York, London, and Berlin,"unanimously" ride the subway wearing their underwear, and read newspapers and magazines as if nothing had happened under the surprised eyes of others. In fact, there is no need to make a fuss, they are just celebrating this slightly exotic festival. Is it really good to dress like this to "swagger through the city"? The content of the "No Pants Day" event is to take the subway without wearing pants. At the same time, participants must be expressionless and act as if they don't know each other. In cold weather places, in addition to not wearing pants, participants 'other clothes must be consistent with winter dress-wearing hats, scarves, coats, etc. The initiator of "Take the Subway Without Pants" is an organization called "Improve Everywhere" in New York, USA. This crazy festival began in 2002. On January 11, 2002, a group of prank-loving New Yorkers decided to take the subway without wearing pants to cause a sensation and encourage people to abandon conservative ideas, try new things, and add fun to their lives. If anyone asks, say,"Forgot to put on pants." The subway scene in Prague, Czech Republic is spectacular. Since then, more and more people have joined the "No Pants Day" event. But the event encountered minor trouble in 2006, when eight passengers participating in the event in New York were arrested by police, but the judge acquitted them on the grounds that wearing underwear on the subway was not illegal. Because this festival can bring novel and exciting experiences, it has now rushed out of the United States and into the world. Adelaide, Australia, was the first to join the list after eight American cities. In 2012, tens of thousands of passengers from 59 cities in 27 countries rode the subway in their underwear that day, including Shanghai and Beijing. On January 13, 2013, the scene of "foreigners" without trousers was startled in the Shanghai subway, shocking the general public, Hamburg, Germany, New York, Czech subway. January 11, 2015, Washington, USA, passengers in the train stared at the female passenger wearing only shorts.