The line comes from StarCraft, Blizzard's 1998 real-time strategy game, where the Protoss are one of three playable factions. Their advisor repeats the warning whenever a player tries to create units beyond the supply provided by existing pylons. Because every Protoss player heard it constantly during matches, the phrase became one of the game's most quoted lines and spread into forums, videos and gaming slang as shorthand for any hard limit. It remains popular decades later because non-players can still understand the joke from the stern delivery alone.