This sound comes from Death Note and is associated with Light Yagami in his Kira persona, whose intense laugh became one of the anime's most recognizable audio moments. The anime adaptation began in 2006, and clips of this scene spread widely through AMVs, reaction edits and villain compilations online. It remains popular because the performance is instantly recognizable to anime fans and it communicates triumph, arrogance and instability in just a few seconds, which makes it easy to reuse in meme formats.