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

The Law Explained

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.