This clip comes from HIKAKIN, one of Japan’s best-known YouTubers, whose “Bun Bun Hello YouTube” greeting became a recognizable online catchphrase. The line spread widely through Japanese internet culture, reposts, remixes, and meme edits, especially in videos parodying classic YouTube intros. It is still used because the delivery is instantly identifiable and exaggerated in a way that makes even a short edit feel louder and funnier. Outside Japan, the sound also circulates as a recognizable Japanese meme intro.