Place it immediately after the false claim, just before the proof appears, then follow it with Oh My God Wow for the reaction and No No Wait Wait while the speaker tries to backtrack.
O tym dźwięku
This is a short, roughly three-second vocal clip built around one drawn-out Spanish word, mentira, meaning lie, delivered in a teasing, incredulous tone that stretches the word for comic effect. It feels playful and pointed at once, like catching someone mid-bluff and refusing to let it pass, with the humour coming from the exaggeration rather than anger.