Raj: Why does Emily like this stuff? Do you think there's something psychologically wrong with her?
Howard: What difference does it make?
Raj: What do you mean?
Howard: Come on, she could have a freezer full of ex-boyfriends' body parts and you'd still go out with her.
Raj: I do like that the ex-boyfriend's out of the picture.

Bernadette: I have to go. Penny ratted me out. FYI, she's getting you a watch for your birthday with money she took out of your wallet.

Penny: You're a big cry baby. You start, I'll join in.
Leonard: I am not a cry baby.
Penny: Toy Story 3.
Leonard: The toys were holding hands in a furnace!

Sheldon: Wow. You're dead, so I'm going to let that slide.

Bernadette: How did that get you into science?
Amy: Oh, I went to the library and took out a book on biology to see what whores did.

Leonard: That's two proposals, one day. Sounds like someone wants to spend the rest of their life telling people how to spell the name Hofstadter.

Howard: Of course you would. You're a loving person. I'm what my people would call a putz.

Sheldon: Thanks for coming with me.
Raj: Thanks for inviting me when everyone else said no.

Bernadette: I don't think the service is going to send any more people.
Howard: Yeah, maybe it's time we just release Ma back into the sea.

Sheldon: Now I know how the African slaves felt. Being dragged from their homes to labor under the yolk of the white man.
Amy: Are you honestly comparing Thanksgiving dinner at Wolowitz's mom's with one of the greatest tragedies in the history of mankind?
Sheldon: Yes.

Bernadette: Hi, dad.
Mike: Hi, honey.
Bernadette: Oh, you brought beer for everybody.
Mike: Uh, yeah, okay. It's for everybody.

Raj: Since you two are going to be around for Valentine's, would you mind watching Cinnamon?
Penny: You have Valentine's plans!? Which came out sounding way more surprised than I meant. Here, let me try that again. You have V..!? See, I can't do it.

Penny: Don't be surprised if you find five chocolates missing and three gross coconut ones with a bite taken out. Came that way when I bought it.

Sheldon: In what world is a 4-4-6-4 a 4-10-4?
Howard: A world I don't want to live in. (To Bernadette) Seriously, I no longer I want to live in this world.

Sheldon: Why would you do that? You're a string theorist as well.
Barry Kripke: Incorrect. I'm a string pragmatist. I say I'm going to prove something that can not be proved. I apply for grant money and then I spend it on liquor and broads.