In the Doom II final level "Icon of Sin", the boss is supposed to be a giant demon head with a fragment missing from its forehead. It says, "To win the game, you must kill me, John Romero!", distorted and in reverse to sound like a demonic chant. One can use the "noclip" cheat to enter the boss and see Romero's severed head which is skewered on a post. John Romero is the creator of the Doom series. The staff didn't like Romero due to his egotistical personality. They decided to get him back by making him the final boss.