Place it just before a reveal in your edit, then follow it with Anime Ahh for the reaction and Awkward Moment to close the scene, keeping the hum as the setup rather than the punch.
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This clip is a single drawn-out vocal hum lasting about ten seconds, with no words in it. It feels awkward and teasing, like someone stalling while everyone waits for a decision, and it works because the pause stretches just long enough to become funny.