Place this clip right after the mistake in your edit, then use a short suspense cue to raise the stakes, and finish with a wrong-answer sting when the outcome is confirmed.
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This short clip is a single drawn-out human voice saying 'oh no' over just over a second, with the first word stretched into a slow, sinking groan before the final word lands. It feels defeated and awkward, like watching a mistake happen with no way to stop it, and it works because the disappointment is instant and unmistakable.