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Famed sound designer Ben Burtt recorded nearly all original sounds for the film. Indy’s distinct gunshot is an unprocessed live recording of a .30-30 Winchester rifle firing (he uses a .455 Smith & Wesson revolver in the film), and the embellished punching sounds come from Burtt hitting a pile of leather jackets and baseball gloves repeatedly with a baseball bat. The sounds for the snakes in the Well of Souls come from the layered noise of Burtt running his fingers through a cheese casserole made by his wife and of wet sponges being dragged across the grip tape on a skateboard. The strange emanations of the Ark ghosts are sea lion and dolphin cries filtered through a vocoder to give them a musical quality, and the sound of the lid being lifted off the Ark is actually Burtt lifting off the heavy top cover of his own toilet. Surprisingly, the sounds of Indy’s whip-cracks are simply outdoor recordings of Harrison Ford and sound effects recordist Gary Summers practicing snapping a bullwhip.

21 Things You Might Not Have Known About Raiders of the Lost Ark | Mental Floss