Hikakin is one of Japan's best-known YouTubers, famous for energetic videos, beatboxing and exaggerated reactions, and his frantic scream has become a recognisable shorthand for losing control online. Clips of his outbursts circulate on Japanese social media and soundboards, where fans reuse the yell as a reaction sound for fails, scares and surprising moments. Because the voice is so raw and unmistakably his, it works even without context, and creators outside Japan also use it when they want a loud, panicked reaction that feels more dramatic than a short English shout.