Put this clip right after the questionable claim in your edit, preceded by a sudden suspense sound to build the doubt, then follow it with a wrong answer game show sound when you want the call-out to play like a final ruling.
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This is a short French voice clip, about five seconds long, of someone firmly saying “Arrête d’mentir,” meaning stop lying. The delivery lands as a blunt, playful call-out rather than a real argument, giving listeners that caught-you feeling that makes an obvious fib instantly funnier and a little awkward for the person telling it.