Place it at the end of a reveal sequence, after a door knocking cue and a dramatic dun dun dun sting, then follow it with a vine boom impact to close the scene.
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This is a sustained, theatrical laugh lasting about nine seconds, performed in a dark, exaggerated style with no spoken words. It feels unsettling and tense, as if a villain or unseen presence is enjoying something cruel, and it can turn an ordinary moment into something menacing. The laugh also carries a playful haunted-house edge, so it works for creepy reveals and dark comedy alike.