C’thun
World of Warcraft is full of nigh-impossible bosses, but this big sack of eyeballs was an especially tough customer. In January 2006, C’thun was patched into the game, and players couldn’t wait to try their luck against the Old God and his endlessly regenerating tentacles. There was just one problem – the boss was unbeatable, even with the highest level gear then available. Turned out the only ones who could topple C’thun were the developers, who soon implemented a number of hot fixes that made the primordial monstrosity fair game, even if he did still boast nearly a million hit points. Eyes on the prize!