Place it right after the clear fail is shown, then follow it with Cat Laugh Meme for the next reaction and Emotional Damage when the embarrassment needs a bigger payoff.
Über diesen Sound
This roughly ten-second clip is built around a cat slapping itself again and again, each slap landing as a small comic hit that keeps the joke going. It feels silly and light, the kind of daft self-inflicted fail that makes people grin rather than wince, with a playful, self-mocking edge.