When Penny locks herself out of the apartment, she comes to hang out with Sheldon in his as he plays Age of Conan. Penny, frustrated by her recent failures in life soon plays and becomes addicted to Conan.
It's very simple. Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and, as it always has, rock crushes scissors
Stuart: Here Sheldon. I pulled the new Hellboy for you. It's mind-blowing. Sheldon: Excuse me! Spoiler alert! Stuart: What? I didn't spoil anything. Sheldon: You told me it's mind-blowing, so my mind is going into it pre-blown. Once a mind is pre-blown, it cannot be re-blown. Stuart: I'm sorry. Sheldon: Said the Grinch to Christmas.