Place it after the knock and the worried question, with no other effect underneath, then follow the reaction shot with a classic fart sound button for the tag, or cut straight to a SpongeBob fail button if the joke needs a deflated ending instead.
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This is a 6.8-second toilet humour clip centred on a grandpa caught in a bathroom moment, built from exaggerated lavatory sound effects. It lands as gross, awkward and shamelessly silly, the kind of uncomfortable comedy that gets a laugh from how undignified the situation feels rather than from a spoken line or punchline setup on its own alone.