Place this clip right after the false claim in your edit, then follow it with the wrong answer game show sound for a callout sequence. For a softer build, put sudden suspense before the claim so this reaction becomes the payoff line.
O tym dźwięku
This is a one-second voice clip of someone stretching out the Portuguese phrase 'é mentiraaa', meaning it's a lie, with the final vowel held for comic emphasis. It feels playful, accusatory and instantly funny, like catching a friend mid-story and calling them out without needing a longer argument or explanation.