Place it right after an on-screen question, before any spoken reply begins. Follow it with the huh sound for a second beat, or end the sequence with the oh my god wow sound when the answer finally lands as a surprise.
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This clip is a single drawn-out 'ammmmm' vocal sound lasting about four seconds, held without words or music behind it. It gives a listener a hesitant, stuck-for-an-answer feeling, like someone buying time while they think. The stretched delivery makes a simple pause feel awkward and funny at once, especially when an answer should have come quickly.