Place it right after the mistake is shown, then follow it with Womp Womp Fail to underline the failure before cutting to the reaction. For a slower payoff, use Awkward Moment next instead, letting the reaction shot carry the moment for the edit.
Об этом звуке
This is a short spoken line lasting about 2.3 seconds, delivered in a mocking, exaggerated voice that lands the phrase 'you done goofed' like a verdict. It feels gleefully scolding and smug, perfect for pointing out a blunder without saying anything yourself. It comes from TFS Hellsing Ultimate Abridged, Episode 1.