The line comes from Mel Brooks' 1974 comedy Young Frankenstein, released in Italy as Frankenstein Junior. In the graveyard scene, Frederick complains about his work and Igor, played by Marty Feldman, replies that it could rain, prompting an immediate storm. The Italian dub turned that exchange into the catchphrase Potrebbe piovere, quoted for decades by Italian audiences. Online it survived as a reaction clip for tempting fate, shared whenever someone says things cannot get any worse and reality quickly proves them wrong.
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Igor says Potrebbe piovere in Frankenstein Junior, just before a downpour hits. Italians drop it as a jinx whenever bad luck is about to get worse.
A man delivers the line Potrebbe piovere, Italian for it could rain, in a deadpan tone that makes the timing the whole joke. The phrase is spoken almost as a throwaway warning, and the humour comes from how instantly the weather, or the situation, proves him right. His flat delivery turns a simple forecast into a curse, as if saying it out loud summons the storm. Listeners who know the scene wait for the crash that follows, and that split second of expectation makes the clip land even without the picture.