The sound comes from gachapon, the Japanese capsule toy machines found in arcades and shops, where turning the handle pays out a random prize in a plastic capsule. The format later defined a whole genre of mobile games built around random character and item pulls, often called gacha games. Clips of the crank, rattle and chime spread through gaming videos, unboxings and edits as a shorthand for random luck. It remains popular because viewers understand the gamble instantly, whether the result is a rare win or a disappointing duplicate.