Place it just after the tension peaks in a horror edit, following Dun Dun Dun to set up the reveal, then cut straight to the reaction shot. Keep it as the payoff moment, with the villain on screen and no competing effect after it.
關於此聲音
This is a short, roughly three-second laugh credited to Molten Freddy. It feels unsettling and mischievous, like a villain enjoying a joke nobody else finds funny, and it lands hardest when the listener already expects something creepy to happen next.