This is an iconic moment. Jack Woltz wakes up with a horse head in his bed, showing him that the Corleones mean business. Apparently, this forces Woltz to give Johnny Fontane (cough Frank Sinatra cough) a part in a movie that will make him a star, despite his personal distaste for Fontane.

In the years since The Godfather debuted, putting a horse's head in someone's bed has become a widely known meme of sorts—shorthand for making someone an offer they can't refuse, or forcing them to give you something they don't want to give you.