Place it at the end of a setup, after the awkward line has landed, then follow it with a short laugh track or a record scratch. Pairing it with a surprised gasp beforehand can also set up the reaction, but keep the moan as the final beat in the sequence.
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This clip is a single human moan, stretched over a few seconds and pushed into comic exaggeration so it reads as a deliberate reaction rather than a real one. It feels awkward, uncomfortable and slightly ridiculous, turning a plain pause into a cringeworthy beat. Listeners usually react with surprise first, then laughter or secondhand embarrassment, depending on how it lands against the scene.