The cash register cha-ching has been used for decades in shops, cartoons and adverts as a universal sign for a purchase, long before short form video made it a meme staple. Online, creators shortened it to a quick standalone effect that needs no explanation in any language, including Turkish uploads tagged para sesi for money sound. It survives because the meaning is instant: a transaction happened, someone profited, or a price reveal deserves emphasis, even when the joke is that the amount is tiny.