Place it near the start of an edit, right after the setup, then follow it with a goofy ahh sound for the reaction and a bruh sound when the joke falls flat.
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This short vocal clip lasts just under six seconds and repeats the nonsense syllables tu tu tu tun ti tun in a bouncy, sing-song rhythm, like someone humming a tune they made up on the spot. It feels silly and instantly catchy, the kind of sound that makes people smile and hum along before they even realise they are doing it.