Place this clip right at the reveal in a fail edit, before a quick cut to the reaction shot. Follow it with a vine boom sound for a bigger second hit, or precede it with a classic fart sound for sillier builds.
About this sound
A short cartoon failure sting built around a drooping, sliding steel guitar line that slides downward over about three seconds. It feels funny and deflated rather than harsh, turning a small mistake into a light, embarrassed flop. The cue comes from SpongeBob SquarePants, where it was used for moments of disappointment and confusion.