Put this clip in your edit right after the laughter peaks, preceded by the Woody Woodpecker laugh and followed by the SpongeBob sad song, so the order runs from other people laughing, to your protest, to a closing beat.
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This is a one-second voice clip of someone shouting 'It's not funny' at full volume. The delivery is blunt and exasperated, turning a complaint into the joke itself. It gives a listener an awkward, scolding feeling, like being told off mid-laugh for finding something funny that clearly was not meant to be.