That painful taste when you vomit comes from hydrochloric acid, which is so strong it can go through stainless steel and eat through paint; a form of it is even used by bricklayers to clean mortar.
Scary rides in amusement parks sometimes turn vomit into a lethal weapon. People puke and the vomit flies around, covering not only the bodies and faces of others on the ride, but sometimes the pukers' noses and mouths, preventing them from breathing. Centrifugal-force rides are especially risky. Heheh.