Place this clip right after the unanswered question in your edit, then follow it with a wrong answer gameshow sting if someone guesses anyway, or a huh ceeday reaction when the confusion spreads to the next person on screen.
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A short 1.3-second voice clip of someone saying the Portuguese phrase 'Ah, eu não sei', which means 'Ah, I don't know'. The delivery sounds like a verbal shrug, caught mid-conversation with no follow-up. It gives listeners a funny, awkward feeling of honest cluelessness, perfect for the moment an answer simply isn't there and pretending would be worse.