Place it at the turning point of a failed attempt, then follow it with a fail sound to underline the flop, or precede it with clapping for a false build-up before the letdown.
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This is a very short, roughly fifth-of-a-second descending boing with a hollow wooden twang, the kind of springy musical effect used for a sudden droop or collapse. It feels silly, bouncy and instantly cartoonish, turning a small failure into a visual gag in sound. It was created by Jimmy MacDonald for the Mickey Mouse cartoon Canine Caddy, released on 30 May 1941.