Place it just after the dramatic reveal in your edit, before a Vine Boom hit, so the laugh leads into a sharp impact and the joke lands at the end.
关于此声音
This clip is a long, theatrical evil villain laugh, lasting about 15 seconds, with a deep, exaggerated cackle. It feels sinister and gleefully menacing, like a cartoon bad guy savouring a victory, while staying playful enough to make listeners smile rather than feel uneasy.