Penny: Hey, Leonard, if you're not busy tomorrow, I have to do a little reception after work.
Leonard: Oh, I would, but we need to make a push on the air force project.
Penny: Oh, are you sure? We're celebrating our new A.D.D. drug, and it'll probably be over in, like, six minutes.

Leonard: I'm sorry, what is this plan you have?
Sheldon: Well, I'm not needed at both places at the same time. And I can also free up extra hours with simple tricks, such as using a minimal amount of words to convey my point.
Leonard: When does that start?
Sheldon: Soon. See, I could've said "in the near future," but I didn't say "in the near future," 'cause "in the near future" is three more words than "soon." "In" one, "the" two, "near" three, "future" four. See "in the near future" is four, "soon" is just one, four is more than one; saving time already.

Raj: Genius. I was gonna say, "Why does anyone think Sheldon's a genius?" But I didn't.

Sheldon: Ah, I'm back, you got me for eight minutes.
Amy: Sheldon, this is silly. You can't expect us to do quality work with you popping in and out like this.
Sheldon: The coefficient isn't lambda, it's lambda sub one. And over here, you should consider the possibility that the brain itself is in two different quantum states. And lastly, do you have any little soup crackers?

Stuart: What you working on?
Bernadette: Trying to catch up on office e-mails before I go back.
Stuart: Oh, that's right, maternity leave's almost over. Are you excited?
Bernadette: Yeah, I mean, I'll miss Halley, but it'll be nice to get out of the house, be intellectually stimulated. Go out to lunch instead of, you know, (points to her breasts) being lunch.

Stuart: Uh, other than burp you or give you a bottle, I don't know what to do right now.

Howard: Hey, what's for dinner?
Bernadette: Meatloaf.
Howard: (half-heartedly) Oh, cool.
Bernadette: Stuart made it.
Howard: (upbeat) Oh, cool.

Howard: Speaking of which, for day care, it'll be easy for me to drop her off, unless you want to do it.
Bernadette: Hmm, guess it should be me.
Stuart: I can't do it; they have a picture of me on file now.

Sheldon: That's it. I'm in breach of my security clearance. I'm going to prison. And you know what happens to people like me in prison. I'll be forced to be some large man's tutor.

Raj: Wait a minute. Hey, let me see your phone.
Sheldon: Why?
Raj: Well, it's possible it was tracking everywhere you went.
Amy: Phones can do that?
Raj: Yeah, it depends on the privacy settings.
Penny: Oh, tha- that's so cool. How do you- how do you turn that thing off? (laughing nervously)
Leonard: Relax. I know when you "go for a run," you stop for a donut.
Penny: I don't even run there, I drive.

Bernadette: I just don't know what the right thing to do is. If I go back to work, I'm abandoning Halley. If I don't go, I'm giving up everything I worked for. It's like there's no right choice.
Howard: Look, I don't know what the best decision is, either. But whatever we choose, if we're not happy, we can undo it.
Bernadette: I guess.
Howard: And the best part is: Halley won't remember a thing. (laughs) Babies are cute, but they're dumb.
(chuckles) I mean, I go like this, she thinks I'm gone. Then magically I'm back. I mean, honestly, why are we saving for college?
Bernadette: I'm not crazy about you calling our baby dumb.
Howard: Well, she gets it from me.

Bartender: You gonna buy another round for the house?
Sheldon: Uh, no, thank you. (To Leonard) We now know why MasterCard sent me a fraud alert.

Leonard: Ask him.
Sheldon: Um, yes. Howdy, partner. Do you happen to recollect if I left a notebook in these here parts?
Raj: These here parts?
Sheldon: It's called fitting in. By the way, good luck.

Bernadette: What if she likes the people who work there more than us?
Howard: She already likes soap bubbles more than us.

Penny: So is this your first time dating a scientist? 'Cause I'm thinking of starting a support group.
Rebecca: Actually, I'm not new to this. I was engaged to a Scientologist.