A Chinese fire drill is a prank, or perhaps an expression of high spirits, that was popular in the United States during the 1960s. It is performed when a car is stopped at a red traffic light, at which point all of the car's occupants get out, run around the car, and return to their own (or go to other) seats. Chinese fire drills are sometimes executed when one needs to get something from the trunk of a car. Occasionally, if one of the participants is late to get inside the car, the others might drive off without him/her. People have reported this phenomenon as early as the 1940s, so it is possible that the phrase was current at the time, but simply was not recorded.