Place it as the closing beat after the failure is shown, then follow it with the Awkward Moment Sound Effect to hold the pause before moving on. For a bigger flop, open with the Womp Womp Fail Sound, let the mistake land, and save this line for last as the final admission.
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This is a short spoken line, lasting under three seconds, in which a single voice says it has done all it can do. The delivery is quiet and resigned, giving the listener a dry, defeated feeling rather than a big laugh. It works as a shrug in audio form, marking the point where effort stops and acceptance takes over.