Place it exactly on the sit in a prank edit, then follow it with a shocked reaction before an oh no no no laugh, keeping the sequence sit, reaction, laugh.
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This is a short whoope cushion burst, lasting under a second, with the familiar rasping, airy squeak of a classic prank cushion being sat on. It lands instantly and feels silly, cheeky and deliberately awkward, the kind of noise that makes a room laugh before anyone can explain it. It works best as a quick, harmless surprise rather than a long gag.