Leonard: Hey, Sheldon, what's up?
Sheldon: Well, remember how disappointed you were when Amy started driving me to work?
Leonard: Sure, uh, sometimes people smile a big smile of disappointment.
Sheldon: Yeah, well, good news, Amy had to go in early to show Howard around her lab, so you get to drive me.
Penny: Aw, his smile of disappointment has turned into a frown of joy.

Leonard: It's fine, I've been driving him for years. What's one more day?
Sheldon: Oh, and I've got a new car game we can play. It's called "What siren am I?"

Amy: We've been working on a computer interface that can use brain wave patterns to control robotic limbs, but we're having a little trouble localizing the signal from the EEG cap.
Howard: Oh, well, have you thought about adding a phased array of sensors for better localization?
Amy: Actually, that never occurred to me.
Penny: It never occurred to me I would miss the Ewok conversation.
Leonard: Good, because I just bought another one on Amazon.

Amy: You know, I could use an engineer on this project.
Sheldon: Well, now, this works out great. Howard's an engineer. I'm sure he knows someone qualified.

Howard: She was talking about me, Sheldon. I'm perfectly qualified.
Bernadette: Yeah, Howie's the world's best engineer. It says so right on his coffee mug.
Penny: Aw, you got him a mug?
Raj: I did. But it's not a competition.
Bernadette: Yeah, I lost that battle years ago.

Sheldon: See, he gets Ewoks in his bed.
Amy: You've got Chewbacca. That's enough.

Penny: Yeah, no more stories about sex, so, Amy, that brings us to you.
Amy: Well, at work we've been doing some interesting research with neuroprosthetics.
Penny: Neat. I've been rewatching The O.C., so we're all leading productive lives.

Leonard: It's the greatest scientific feud of all time. I mean, you can forget about Leibniz and Newton.
Penny: Done.

Penny: So, Tesla's the one that invented the electric car?
Sheldon: (laughs) No, Penny. No, the car is just named after him.
Penny: Okay, you don't have to be so smug about it. You know, you went to see that movie It because you thought it was about scary I.T. guys.

Barry Kripke: Whoa, whoa, whoa. You didn't tell me we were doing this just to stick it to Sheldon.
Leonard: Well-
Barry Kripke: I messing with you. This sundae just got a cherry on top!

Beverly Hofstadter: Hi, Pen- Oh, hello, Leonard.
Leonard: Hello, Mother. How are you?
Beverly Hofstadter: Fine. And you?
Leonard: I'm great.
Beverly Hofstadter: Well, it's been lovely catching up.
Leonard: Wait. Hang on. We need to talk.
Beverly Hofstadter: Oh, brother.

Leonard: I want to know, why aren't you proud of me?
Beverly Hofstadter: Well, isn't the real question, "Why aren't you proud of yourself?"
Leonard: No, that is a question - and I ask it a lot - but let's stick with the one I asked you.
Beverly Hofstadter: But why do you think I'm not proud of you?
Leonard: Because you never say it. But two days into chatting with Penny, and you can't stop telling her how great she is.
Beverly Hofstadter: She is great. Honestly, of all of my children's spouses, she's the one that I'm most impressed by.
Leonard: Seriously?
Beverly Hofstadter: Yes. She's confident, she's thoughtful, and she never complained about you once. I know what kind of strength that takes.

Leonard: So, Penny's your favorite?
Beverly Hofstadter: I suppose she is. You married well, Leonard, and for that I am proud of you.
Leonard: I don't- I don't- I don't know what to say.
Beverly Hofstadter: I'm also proud of how hard you're trying not to cry.
Leonard: (choking up) Thank you.
Beverly Hofstadter: Would you like to hang up now?
Leonard: Yeah, here it comes.

Howard: Now you're gonna want to slowly switch lanes.
Sheldon: Why?
Howard: Because there are only two, and you're not in either of them.

Sheldon: You're a good teacher. Your son is going to be lucky to have you as a father.