Raj: Does this place look familiar?
Sheldon: It's hard to say.
Bartender: Hey, Sheldon's back!
Everybody: Sheldon!
Sheldon: It's getting clearer.

Leonard: Should we give them their privacy?
Penny: I want to, but I don't think I can.
Sheldon: (from across the hall) Whoopee!
Penny: Okay, I'm good now.

Penny: So, do you want to come?
Amy: No, thanks. I already live in a place all the nerds come to.

Howard: How'd you even get that up the stairs?
Sheldon: I said to myself, "I think I can, I think I can." And then I couldn't, so I paid two men who promised not to come rob us later.

Sheldon: It's not my fault I'm bad at sharing; I skipped kindergarten.

Raj: Well, I'm glad to see you moving forward.
Sheldon: Bert did quality research. And he deserves whatever accolades he receives.
Howard: What is going on? (To Leonard) Did you upgrade his software last night?
Leonard: I think he might be learning on his own.
Raj: Then the robot uprising has begun.

Sheldon: I don't understand why I can't talk at this meeting.
Leonard: 'Cause when you talk, it enrages people.

Penny: I didn't know you could drink while you were breastfeeding.
Bernadette: Yeah, they say the yeast in beer helps with milk production.
Amy: I'm pretty sure that's a myth. Let me check.
Bernadette: Ruin it for me, and I'll break this glass over your head.

Raj: I really can't thank you enough for taking me in. You know, I was in a pretty low place in my life, and-
Sheldon: (from across the hall) Oh, Amy, you naughty vixen.
Raj: Anyway, uh, as I was saying, I was at a pretty low place in my life and, uh, if it wasn't for friends like you-
Amy: (from across the hall) My goodness, that form of stimulation is highly efficient.
Raj: I can't compete with that.

Sheldon: *knock knock knock* Amy. *knock knock knock* Amy. *knock knock knock* Amy.
[Amy opens the door. Sheldon is on one knee, holding out an engagement ring]
Sheldon: Will you marry me?

Bert: It makes sense you two are friends. I mean, hot girls always stick together.
Amy: And you thought this wasn't gonna be a great party.
Penny: You know, I had no idea Caltech is exactly like my high school.
Amy: Well, it's not exactly like it. We're all extremely smart.
Penny: Wow. You popular girls are mean.

Colonel Williams: What's this?
Leonard: Oh, nothing. Just some math we don't need.
Colonel Williams: This is a different approach. Are you trying to get the guidance system even smaller?
Leonard: It's just a theory. Uh, it's not even worked out.
Colonel Williams: Oh. I want this.
Howard: But we've already met the agreed upon specs. Going smaller would require weeks' worth of new computations.
Colonel Williams: So get the kid with the two shirts to do it.

Raj: Hey, this pregnancy had an emotionally-needy third wheel way before you came along.

Howard: Sir, we've hit a bit of a snag. We're already behind schedule.
Sheldon: The computations required to overcome the deployability issues are more significant than we thought.
Leonard: I understand that we're under contract, and I don't know what the consequences of violating that are, but, uh we're not gonna be able to deliver in the time we promised.
Colonel Williams: (gets up and sighs) How long do you need?
Howard: We're thinking two years.
Colonel Williams: All right.
Howard: (chuckles) That's it? You're okay with that?
Colonel Williams: (scoffs) You think you're the first government contractor who isn't gonna deliver on time? We're still waiting for a big space laser Reagan ordered to beat the commies.

Leonard: You know, I do have a way to get him out of our hair. I've been holding onto this for a few years, but maybe now's the time.
Howard: We can just lock the door; you don't have to kill him.
Leonard: You can't kill him; he'll just respawn at the last save point.