What's your favorite example of Chekhov's Gun in a movie?

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Anton Chekhov famously said, "If you say in the first chapter that there is a rifle hanging on the wall, in the second or third chapter it absolutely must go off. If it's not going to be fired, it shouldn't be hanging there." This concept, known as Chekhov's Gun, is often used in storytelling to create suspense and foreshadowing. So, fellow movie enthusiasts, which film do you think executed Chekhov's Gun the best? Share your favorite examples and discuss their impact on the story https://19216811.cam/  https://1921681001.id/ !