Howard: How did you get so brave all of a sudden?
Raj: It's easy. The spider's crawling up your arm.

Howard: You know, I'm really glad you decided to learn Mandarin.
Sheldon: Why?
Howard: Once you're fluent, you'll have a billion more people to annoy instead of me.

Bernadette: Maybe we should get one of those machines to help her up the stairs.
Howard: You mean a forklift?

Sheldon: Sheldon Cooper does not cry.
Howard: That's true, you'd rust.

Sheldon: You know, in difficult moments like this, I often turn to a force greater than myself.
Amy: Religion?
Sheldon: Star Trek.

Penny: Are you saying that Amy is, oh, what's the scientific word-
Sheldon: Forget science: she's horny.

Amy: Ears and genitalia.
Sheldon: Interesting. Not body parts that usually team up. What about environmental factors. Describe the scene for me?
Amy: I was sitting in a restaurant with Penny and Bernadette drinking water. Carbonated as it was a special occasion. Penny's friend Zack stopped by and said 'hello' and I said 'whoo'.
Sheldon: Who?
Amy: Zack.
Sheldon: Then why did you ask?
Amy: Ask what?
Sheldon: Who?
Amy: Zack.
Sheldon: All right, lets start over. What did you say when Zack walked in?
Amy: 'Whoo'.
Sheldon: Zack.
Amy: Why do you keep saying Zack?
Sheldon: Because you keep saying who?
Amy: I'm not saying 'whoo' now, I said 'whoo' last night.
Sheldon: And the answer is Zack, correct?
Amy: There was no question, I simply said 'whoo'.
Sheldon: All right I think I have enough to go on.