Place it at the reaction beat right after the joke reveal, before you cut to the payoff. Follow it with the Anime Ahh Sound Button for a bigger release, or precede it with the Awkward Moment Sound Button to build the pause.
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This is a short voice clip of a Death Note character saying he can't laugh yet while trying to hold it in. The delivery sounds strained and barely contained, which makes it feel both tense and funny, like a laugh is about to break through. It comes from the anime Death Note.