Campanella is the Italian word for a small bell, and in schools it has long marked the start and end of lessons and the break known as ricreazione. Recordings of that ringing spread online as a clean, recognisable school cue, often filed alongside a simple ding sound effect for classroom scenes. Creators reuse it far beyond Italy because the meaning is instant even without dialogue, making it useful for pranks, sketches and edits where a timetable shift, a dismissal or a nostalgic school memory needs to land in seconds.