elevator roulette
elevator roulette, noun phrase. A game one can play when one is the sole occupant of an elevator. The object of the game to fart, preferably a really smelly one, gambling that you will be able to get off before the next person gets on, preferably shortly before the next person gets on.

Getting in, she immediately found herself trapped in a stalled elevator in which some odious person had just played elevator roulette. She gagged as her eyes began to water, the overpowering stench permeating her freshly shampooed hair and the expensive silk blouse she had just had drycleaned.