Place it just before the reveal in a gaming fail edit, after Sudden Suspense builds the tension, then follow the fall with Minecraft Oof for the landing, keeping the wail as the centrepiece of the joke.
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This clip is a long, drawn-out wail from the Mancubus, the bulky, slow-moving demon, stretched into a wavering wwwwwahh that rises and falls like a creature groaning in disappointment. It feels comically mournful and clumsy rather than frightening, as if a huge monster is complaining instead of attacking. The sound comes from Doom, where the Mancubus is a familiar enemy.