School bells have long been used in schools around the world to mark the start and end of lessons, breaks, and the school day, which is why the sound is instantly recognised across cultures and languages. In Spanish it is known as timbre de escuela, and the same ringing tone appears in countless classroom videos, school-themed memes, and comedy sketches online. Its continued popularity comes from that shared memory: almost everyone has heard it, so creators can use it as shorthand for school life, deadlines, and getting caught out.