Vomit

Vomit is the reflexive upchucking of partially digested stomach contents. It is often related to nausea, smells bad and has a contagious effect. Lots of vomit is produced on boats in stormy seas. Vomit is also produced in airplanes, and is so commonplace that dedicated vomit bags are provided for passengers.

Rats and mice can't vomit, which makes rodenticide more effective at killing them, and safer for other species.

Vomitoriums are all-you-can-eat restaurants where you are encouraged to vomit to make room for more food.