Sheldon: He wrote back! "Cooper and Hofstadter resorting to juvenile attempts at humor is proof they have nothing to back up their ridiculous paper. It should come as no surprise given they work at Cal-Tech, essentially a technical school where even the physicists are basically engineers".
Oh, engineers. Do you know how insulting that is?
Howard: Yes.

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.

Josh: So, I have to ask, was the robot sexy?
Howard: It was actually just a mechanical hand.
Josh: 'Cause that's all you need, right?
Howard: You are my brother.

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

Sheldon: I like it. I think you're on to something.
Leonard: Really? You're not messing with me?
Sheldon: Not at all. In fact, I have got something for just such an occasion. I was starting to think I'd never get a chance to give it to you. Good job!
Leonard: You're giving me a sticker?
Sheldon: Not just a sticker. That's a sticker of a kitty saying "Mee-wow".
Leonard: I'm not a preschooler.
Sheldon: Fine, I'll take it back.
Leonard: I earned this. Back off.

Sheldon: Can I respond now?
Leonard: Do it.
Sheldon: You mess with the bull, you get the horns. I'm about to show this guy just how horny I can be.
Leonard: Somebody else do it.

Bernadette: (In pageant video) And you should pick me for Miss. California Quiznos 1999, because I want to tell you what I want, what I really really want. I'll tell you what I want, what I really really want. I wanna. I wanna. I wanna. I wanna, really, really, be the California Quiznos 1999.