School bells have long been used in classrooms to mark lesson changes, and recordings of that familiar ringing have become a staple sound effect for video creators online. Because the sound is instantly recognisable, it is often reused in educational content, school-themed comedy, explainer videos and short-form edits to set a scene in seconds without any dialogue. Similar short alert tones, like a ding sound effect, work in the same way, signalling a transition or a moment of attention. Its simplicity and clarity help explain why it remains popular across classroom and social video formats.