Susano is a well-known figure from Japanese mythology, the storm god whose name appears in many anime, games and fantasy stories, which is why this short line is easy to recognise. The phrase 'let the revels begin' sounds like a formal invitation to a festival or feast, and creators have picked it up as a ready-made cue for celebration and chaos. Shared through soundboards and short-form edits, it has become a handy way to open a clip with energy, and it remains popular because the wording is clear, dramatic and fits almost any lively moment.