Place this clip right at the moment of failure, then follow it immediately with a shocked sound for the reaction and finish with the oh no no no laugh as the group loses it in the final cut.
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This is a brief two-second fart effect with a soft, slightly squeaky tone instead of a loud blast. It feels goofy and mildly embarrassing rather than gross, landing as a harmless, childish joke. The clip comes from a library-style upload credited to SoundBible.com, not from a film, show or character.