Chinese fire drill definition

Perhaps from the WWI era, from the British practice of using Chinese as a slur; now used only as a festive exclamation.

A prank performed while stopped in a car at a red-light; each passenger (including the driver) shouts "Chinese fire drill", exits the vehicle, runs at least once around it, then re-enters, taking a different seat.
A silly, pointless exercise.

Although this term seems to have lost all traces of an insulting meaning, it is possible some might be offended.