Zenitsu Agatsuma is a Demon Slayer Corps member in Demon Slayer: Kimetsu no Yaiba, the manga and anime series where his cowardly, sleep-prone personality contrasts with his Thunder Breathing skill. His exaggerated screams became a favourite reaction sound online because they sum up pure panic in four seconds. Clips of his voice circulated through anime edits, TikTok and YouTube Shorts, turning this moment into a go-to scream meme for situations that are scary, embarrassing or dramatically overblown, long after the original scene aired.