Place it immediately after the fail in your edit, then let Sad Violin follow for the finish, or put Nelson's Ha-Ha first for a second hit before cutting to the reaction shot.
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This is a short, roughly two-second clip of a man laughing out loud with a repeated ha ha ha, delivered in a loud, mocking tone that sounds aimed straight at someone who has just slipped up. It feels teasing and gleeful, the kind of laugh that turns a small mistake into a shared joke and makes the moment feel lighter rather than mean.