Place it as the payoff after the setup, preceded by a classic fart sound effect to build the gag, then follow it immediately with a vine boom sound effect for the reaction beat before moving on.
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This is a nearly nine-second exaggerated bathroom effect built from wet, splattery noises that hit all at once in a deliberately overblown way. It feels gross, sudden and uncomfortable in a funny way, landing as a shock laugh rather than anything realistic, perfect for toilet humor and stomach disaster gags.