Put it immediately after the mistake is revealed, not before the setup, so the reaction lands on the reveal. Pair a Wrong Answer Game Show cue just before it to flag the error, then follow with Nelson Ha Ha to close the joke and keep the edit moving.
Über diesen Sound
This four-second clip repeats a sharp tutting voice several times in a row, turning a small scolding sound into a brisk rhythmic pattern. It feels playfully disapproving, like catching someone in a silly mistake and shaking your head at them. That mix of judgment and light comedy makes it an easy cue for embarrassing or obviously wrong moments.