Place it right after the failed attempt in the edit, then follow it with Nelson's Ha-Ha! as a second laugh from another voice. For a longer reaction chain, add the laughing dog afterwards to keep the joke going without repeating the same laugh twice in a row.
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This is a single hard laugh lasting just over four seconds, loud and unrestrained, with the kind of breathy, shaking delivery that sounds like someone has completely lost control. It feels contagious and mocking at once, turning an awkward slip, a bad joke or a failed attempt into something funnier, and it works best as a blunt reaction to a moment that already went wrong.