The laugh belongs to Natsuiro Matsuri, a Japanese virtual YouTuber with Hololive known for her energetic, mischievous personality. Fans began clipping her most unhinged giggles from livestreams and sharing them as reaction sounds, where the contrast between her cute voice and manic delivery made them instantly recognisable. The clip spread through meme edits, short-form videos and soundboards, often used to signal a scheming or villainous turn. It remains popular because it delivers a complete character moment in just a few seconds.