The cash register sound comes from the mechanical tills used in shops for over a century, where opening the drawer rang a bell to signal a sale. That noise became a familiar shorthand in cartoons, comedy sketches, and television for money being earned or spent, long before short video apps existed. On TikTok and in memes it spread as a quick audio punchline for payday, shopping hauls, side hustles, and lucky wins, because listeners recognise it instantly without any explanation. Its staying power comes from that clarity: one ding says money, success, and reward in less than two seconds.