In a slapstick edit, save it for the final beat of the sequence, then follow it with a fail sound meme to close the gag, keeping earlier reaction sounds before it so the ending stays clean.
About this sound
This is a 0.36-second metal clank take, a sharp head bonk effect from a classic cartoon sound library. It feels instantly funny and startling, the kind of abrupt jolt that makes a clumsy hit feel bigger and sillier than it was. It was created by Jimmy MacDonald for the Pluto cartoon First Aiders in 1944.