It is illegal to emit an obnoxious odor in an elevator.

The Law

This highly specific ordinance was passed to maintain common courtesy in the enclosed, poorly ventilated elevators of early 20th-century office buildings. While an obnoxious odor could technically refer to cheap perfume or a strong onion sandwich, it is widely interpreted as a ban on passing gas in a lift. Enforcement, however, requires catching the silent-but-deadly culprit red-handed.