The 1-Up sound comes from Nintendo's Super Mario Bros. era and is tied to the moment Mario gains an extra life. It became one of the most recognisable retro game sounds from the 8-bit period, helped by decades of Mario releases, compilations and fan videos. Online, people use it as a quick shorthand for success, bonus points or unexpected good luck. Its staying power comes from how short, clean and instantly readable it is, even outside gameplay.