Place it immediately after the mistake is shown, so it answers the fail instead of introducing it. Open with Roblox Oof for the impact, then let this clip deliver the judgement, and close with Nope if the person doubles down on the error.
About this sound
This is a short two-second voice clip of a speaker delivering the line 'You are one stupid little boy,' stretching out the word stupid for extra scorn. It lands as a blunt, dismissive roast, funny because the insult is slow, deliberate and oddly childish rather than angry.