Place it at the reveal point of a bathroom scene, after a door knocking sound builds the wait outside the stall, then follow it with a classic fart sound to close the sequence before cutting away.
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This is an 8.5-second effect built around a toilet flush mixed with wet squelching, bubbling and scuttling noises that suggest something alive in the pipes. It leaves listeners feeling both queasy and amused, leaning into silly horror rather than real fear, with the drawn-out plumbing sounds making the gag feel nastier the longer it plays.