Place it as the reveal at the end of a short build-up, after the question about Rob has been asked. Follow it straight away with Dun Dun Dun, then add Vine Boom to underline the reaction and close the scene.
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This is a short spoken clip, just under four seconds long, built around a single voice introducing Rob in a plain, matter-of-fact way. The delivery is blunt and unexpected, which makes it land as awkward and funny rather than dramatic, and it works best as a quick, deadpan reveal that catches listeners off guard.