To make the movie more realistic, Joe Pesci wanted Macaulay Culkin (Kevin) to genuinely feel scared of him, so he tried to see him as little as possible on set. Once, Pesci actually wounded the child actor by accident. It happened when they were practicing the scene where the two criminals hang Kevin up on a hook, and Pesci’s character says, "I’m gonna bite off every one of these little fingers one at a time." The actor did indeed bite Macaulay’s fingers, drawing blood.