Place it right after the name or face is revealed, then follow with You What for a second reaction beat before cutting back to the main audio. It also works before a DJ Airhorn hit when the reveal is meant as a joke.
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A short Spanish voice clip, about three seconds long, of a man politely saying 'perdón, señor, ¿me puede explicar quién es?' The delivery sounds earnest and a little lost, which gives it an awkward, confused feeling that works when an introduction makes no sense at all.