Place it right after the mistake in a fail edit, then follow it with Oh My God Wow for the next reaction and Wrong Answer Game Show when the moment was a clear error.
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This clip is a single drawn-out human ahh, lasting about one and a half seconds, with the voice rising and holding the sound without words. It feels sudden, dramatic and a little over the top, like the moment someone realises something has gone badly wrong. It works as a pure reaction, carrying panic and disbelief in one breath.