Stamin-Up is one of the perk-a-cola drinks in Call of Duty Zombies, giving players increased sprint duration and faster recovery from sprinting. Its machine plays this advertising-style jingle when the perk is purchased, a design choice that made the Black Ops Zombies perks feel like products in a strange, cheerful vending world. Clips of the jingle spread through gameplay videos, montages and meme edits, where it signals speed, stamina and old-school Zombies nostalgia. It remains popular because it is instantly recognisable to fans, even outside a match, and works as shorthand for classic Zombies gameplay.