Young Frankenstein
Marty Feldman really had some fun with this spooky role. Over the course of filming Young Frankenstein, his back hump moved from side to side from shot to shot. It was a visual gag for the audience, but he also improvised a joke about it in one scene. When the doctor says he can probably help Feldman out with the hump on his back, he wasn't supposed to respond, but instead came back with "What hump?"
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