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Place it midway through the edit just as the unfamiliar person becomes the focus, then follow it with a huh reaction for the double take. If the reveal needs building first, put a sudden suspense sting before it to set up the interruption cleanly.
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A just under seven second voice clip of someone blurting out 'wait a minute, who are you?' as if only just noticing a stranger. It lands as confused and mildly suspicious, with that caught off guard awkwardness that makes a simple question feel funny and confrontational at the same time without turning truly hostile.
