20. Having your faced burn off by acid
As Seen In: Seed of Chucky (2004)
Every now and then, stunt casting works, especially in a movie that would otherwise leave serious cinephiles completely uninterested. For the dismissible Child's Play sequel Seed of Chucky, the filmmakers reached directly for admirers of trashy midnight movies when they hired Pink Flamingos director John Waters to play a small role. But, instead of just having the always game-for-whatever Waters walk on and wave, they gave him something special to do.
In an overly dramatic but nevertheless cheekily humorous scene, killer doll Chucky spooks Waters' character, causing a bodily jolt that sends him flying backwards to knock over a jar full of acid. The deadly liquid pours onto his head, causing half of his face to melt off like dripping, gooey wax.