In Hitchcock's Psycho (1960), the knife never actually touches Janet Leigh's body in the famous shower scene. 78 camera cuts in 45 seconds created the illusion of violence — and the chocolate syrup used as blood never showed red on black-and-white film.
The mechanical shark in Jaws broke down so often that Spielberg was forced to keep it off screen. The decision to hide the shark made the film far scarier — audiences imagined something worse than any prop could deliver. Jaws became the first modern blockbuster.
In The Dark Knight (2008), the scene where the Joker claps slowly while in prison was completely unscripted. Heath Ledger improvised it on the spot, and the confused reactions from other actors are completely genuine.
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