Put it near the end of an edit, after the reveal has landed, and let the Dun Dun Dun build the tension first. Follow it with the Vine Boom to punctuate the moment and close the scene before the next cut.
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This is a long, theatrical macabre laugh lasting about seven seconds, a slow, mocking cackle that builds into a full, unsettling burst of laughter. It feels creepy and gleefully sinister, like a villain savoring a plan that has just worked, and it lands best when the joke is dark rather than light. It turns an ordinary reveal into something deliciously wrong.