Because I'm stupid!
Leonard: What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
Sheldon: Screwed.
Leonard: There you go.
Sheldon: 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.
Sheldon: Why are you crying?
Penny: Because I'm stupid!
Sheldon: That's no reason to cry. One cries because one is sad. For example, I cry because others are stupid, and that makes me sad.
Sheldon: I made tea.
Leonard: I don't want tea.
Sheldon: I didn't make tea for you. This is my tea.
Leonard: Then why are you telling me?
Sheldon: It's a conversation starter.
Leonard: That's a lousy conversation starter.
Sheldon: Oh, is it? We're conversing. Checkmate.
Howard: Well, she's free to examine my briefs (about Sheldon's sister).
Leonard: Howard!
Howard: I know! I'm disgusting. should be punished. By her. Oh, look I did it again.
Wolowitz: Sex is never the way I dreamed it was going to be.
Raj: Because in your dreams, you're a horse from the waist down.
