Place it at the exact reveal beat in your timeline, after your setup shot and before any reaction cut. Follow it with the To Be Continued sting for a cliffhanger ending, or lead into it with the Za Warudo time stop when a character freezes before the twist lands.
About this sound
This is a long, roughly 37-second burst of villain laughter that begins as a low, held-back chuckle and builds into loud, manic, unrestrained cackling. It feels triumphant, arrogant and darkly funny, creating tension as control gives way to madness. It comes from Death Note, voiced as Light Yagami in his Kira persona after a plan succeeds.