The mechanical cash register sound has been a staple of retail scenes in film and television for decades, long before electronic point of sale systems added built-in receipt printers. As tills moved online as stock effects, the combined keys, drawer and printer sequence became a shortcut for a completed transaction. Creators now reuse it far from real shops, dropping it into gameplay, unboxings and pricing jokes where the familiar printing whir signals that something was bought, sold or charged, even when no till is visible on screen.