Put it near the end of a bathroom joke, after the fart sound and before the big reaction, so the flush becomes the payoff of the scene. Follow it with the vine boom for a hard cut to the next scene.
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This clip is a full toilet flush from a built-in wall toilet, running for just under 12 seconds with the watery rush of a real bathroom flush. It feels awkwardly funny and instantly recognisable, the kind of sound that makes a room laugh or cringe in the same moment.