Sheldon: Penny, hello.
Penny: Hey, Sheldon.
Sheldon: What is shaking?
Penny: I'm sorry?
Sheldon: It's colloquial, a conversation opener. So, do you find the weather satisfying? Are you currently sharing in the triumph of some local sports team?
Penny: What's wrong with you? You're freaking me out.
Sheldon: I'm striking up a casual conversation with you. S'up?
Penny: Please don't do that.
Sheldon: All right, But I'm given to understand that when you have something awkward to discuss with someone, it's more palatable to preface it with banal chit chat.
Penny: So, this wasn't the awkward part?
Sheldon: No.

Raj: I don't like bugs, okay. They freak me out.
Sheldon: Interesting. You're afraid of insects and women. Ladybugs must render you catatonic.

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: *knock knock knock* Leonard? (x3)
Leonard: What, Sheldon!? What, Sheldon!? What, Sheldon!?
Sheldon: Tell me what you see here.
Leonard: The blunt instrument that will be the focus of my murder trial?

Sheldon: I would ask you to find some way to suppress your libido.
Penny: I could think about you.
Sheldon: Whatever works.

Raj: Ooo.
Penny: What's the matter, Lassie? Did Timmy fall down the well?