The sound comes from Apple's iPhone line, first released in 2007, where short built-in tones were used to separate calls, texts and app alerts. As iPhones became widespread, that message chime became one of the most recognised notification sounds in public and online. Clips, parodies and prank videos reused the recording out of context, so hearing it now often triggers the same reaction offline and on social media. Its continued use comes from that instant recognition rather than novelty, making it a shorthand for a phone notification.