Place this clip at the very end of a reveal sequence, after a build-up sound has done its work. Pair a rising moment like sudden suspense before it, then follow with sad violin for the aftermath, or use a wrong answer game show hit when the letdown is a failed guess.
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A very short spoken clip of a flat, deadpan voice delivering the line 'And this was a disappointment' in about one second. It lands with a deflated, anticlimactic feeling, like all the build-up just drained away, making the letdown sound both resigned and quietly funny rather than angry or dramatic.