John Travolta, Phil LaMarr, Samuel L. Jackson in Pulp Fiction
According to an interview with Phil LaMarr, it was he who came up with the idea of his character Marvin being shot in the face. Marvin was originally supposed to be accidentally shot in the throat and survive. Knowing that Marvin would die a slow, painful death, Vincent and Jules decide that Marvin should be shot in the head and put out of his misery. Knowing that this would make the characters unlikeable, LaMarr took his idea to Quentin Tarantino and he agreed to it, figuring that a single-bullet kill would be funnier.
Pulp Fiction IMDB