Stink bomb

A stink bomb is a device designed to create an unpleasant smell. They range in effectiveness from simple pranks to military grade malodorants or riot control chemical agents.

The Guinness Book of Records lists two smelliest substances. One is "US Government Standard Bathroom Malodor"; a mixture of eight chemicals with a stench resembling human feces, only much stronger, designed to test the efficacy of deodorizers and air fresheners. Another one, "Who me?", is a mixture of five sulfur-containing chemicals and smells like rotting food and carcasses.