Place it immediately after the false claim in a reaction edit, letting the denial set up the accusation. Start with No No Wait Wait to build the protest, then cut to this clip for the call-out, and finish with Nelson's Ha-Ha! when the fib has been fully exposed.
About this sound
This is a short, blunt spoken outburst in which a man accuses a kid of lying, delivered with sharp disbelief and no hesitation. It lands as funny and indignant at once, the kind of line that turns a small fib into a dramatic call-out. Its direct wording and heated tone make it easy to recognise even without any visual context.