Brainrot became a dominant short-form trend in 2025, driven by Italian brainrot videos featuring AI-generated animal characters, fake Italian narration and endlessly repeated names. As creators posted episodes in rapid series, they began using a consistent outro song to give each short clip a clear, repeatable ending. The track spread through TikTok, YouTube Shorts and meme compilations as a shared format cue, copied from edit to edit. It remains popular because regular viewers recognise it instantly, even when the characters and jokes change completely.