Put it right after the mistake is shown, letting a wrong answer cue it, then follow with Nelson's Ha-Ha before cutting to the next scene, so the callout lands as the punchline of the sequence.
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This one-second clip is a single Italian voice shouting Vergognati, meaning shame on you, in a sharp, scolding tone. It lands as a quick, mocking rebuke that makes the target feel caught out and the listener laugh at the embarrassment. The voice comes from La Zanzara, giving the scolding a familiar radio-show sting.