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Psycho Is the First U.S. Film to Feature a Toilet Flushing
At a time it was considered inappropriate to show a toilet being flushed on screen, Alfred Hitchcock saw an opportunity to add some extra shock to his already shocking film—presenting a scrap of paper, which proves an important clue, failing to flush in a toilet. In the book, the clue was an earring found in the bathroom, but Hitchcock changed it to a piece of paper actually in the toilet, partly to add an extra jolt for viewers.