Amy: Hey, Penny, isn't that your old boyfriend Zack?
Penny: Oh, yeah.
Amy: Are you gonna say hi to him?
Penny: Um, I don't know.
Raj: Hey, while you decide, who was better in bed, big hot Zack or wheezy little Leonard? Neener-neener.

Bernadette: I brought sparkling cider.
Sheldon: Oh, the bubbles tickle my nose. I'll just open this now so it can get nice and flat before we drink it.

Amy: Well, I'm going. You couldn't stop me from getting a massage at the mall, and you're not stopping me now.
Sheldon: I shouldn't have to see my girlfriend get groped in public by another man.
Amy: And I shouldn't have to see my boyfriend riding on a train for children around the mall.
Penny: The little choo-choo for toddlers?
Amy: And now you know why I needed the massage.

Raj: Zack, this is my friend Claire.
Zack: You're hot. You seeing anybody?
Raj: Uh, she's seeing me.
Zack: Why'd you say she's your friend?
Raj: We're just keeping it casual.
Zack: Why is he being casual with you? You seem great.
Claire: I don't know. Ask him.
Zack: Why are you being casual with her? She seems great.

Bernadette: Wow, this night turned out to be so much more fun than I thought.
Sheldon: Oh, the fun doesn't stop. You're still going home with a goodie bag full of toast.

Bernadette: What is it about trains that you like so much?
Sheldon: What an interesting question. When I was a child, life was confusing and chaotic for me, and trains represented order. I could line them up, categorize them, control them. I guess you could say that they gave me a sense of calm in a world that didn't.
Bernadette: That's lovely, Sheldon.
Sheldon: Well, other than when they're chugging through your bowels, these things are magic.

Bernadette: Thank you for this. You know, ever since people found out I'm having a baby, I feel like I became Pregnant Bernadette. It was nice to take a little break tonight.
Sheldon: I can understand that. From the moment people realized I was a genius, I've been Sheldon the Genius. Although I've never really wanted a break from that, so I suppose I don't understand. Which is ironic, 'cause, you know, genius.

Leonard: Morning.
Sheldon: Morning.
Leonard: Ugh, too much wine.
Sheldon: Oh, I overdid it myself last night. Hair of the dog.

Sheldon: And any time you need a break from being Bernadette the Pregnant, Bernatrix the Warrior Queen is here waiting.
Bernadette: I might just take you up on that.
Sheldon: Well, mind you, now, that offer's only good until the third trimester. I can't risk getting amniotic fluid on my spot.

Leonard: Hey, did you ever think about the military applications for the guidance system?
Sheldon: Of course.
Leonard: Does it bother you?
Sheldon: No, it did at first. But then I talked it through with Frank and Alicia, and they really helped put things into perspective.
Leonard: Who are these people?
Sheldon: Leonard, friends are like toilet paper. It's good to have extras under the sink.

Amy: Well, it sounds like a nice night. We should go.
Sheldon: Wine again? Yeah, no, thank you. I like my grapes the old-fashioned way, in a juice box.

Raj: They know that we're not exclusive, and we just don't ask too many questions.
Sheldon: You know, it's like how I play Warlords of Ka'a with you and Elder Sign with Frank and Alicia.
Leonard: Who's Frank and Alicia?
Sheldon: You, you and I spend a lot of time together. Can there be a little mystery between us?

Bernadette: So what do you want to do tonight?
Sheldon: Oh, I have quite the evening planned. Our foetus-friendly festival of fun begins with an in-depth look at the world of model trains, and then we'll kick things up a notch and explore all the different ways that you can make toast.
Bernadette: There's more than one?
Sheldon: You've heard of French toast?
Bernadette: (upbeat) Yeah.
Sheldon: Cinnamon toast?
Bernadette: (upbeat) Yeah.
Sheldon: Melba toast?
Bernadette: (upbeat) Yeah.
Sheldon: You get where I'm going here?
Bernadette: (downbeat) Yeah.

Sheldon: I am going to record this for posterity.
Leonard: All right, here goes nothing.
Sheldon: Here goes nothing? This is the initial test of our prototype. Can we give it a little more gravitas?
Leonard: Fine. Preliminary trial of the infinite persistence gyroscopic navigational system, phase one commencing.
Sheldon: Eh, maybe it's your voice. I'm gonna see if I can get James Earl Jones to do it in post.

Raj: You can't let this stop you. Almost any scientific advancement can be used for destructive purposes.
Amy: It's true. Even Einstein's theory of relativity was later applied to the development of nuclear weapons.
Penny: E equals MC squared. Yeah. E is for energy, M for mass, and C for the speed of light.
Amy: How do you know that?
Penny: Oh, Leonard mumbles it when he wants sex to last longer.