People ride the subway without trousers during an event "No Pants Subway Ride" in New York, the U.S., on Jan. 9, 2011. Participators who attend the event ride the subway without trousers in New York on Sunday.
This event that started in 2002 in 50 cities around the world stresses that everybody should "keep a straight face about it". (Xinhua-Yonhap)
