Penny: You know, not everyone needs to have kids to be fulfilled.
Bernadette: You're right, you've got Leonard. What more do you need?

Sheldon: Well, I, for one, applaud Raj's decision to forgo emotional attachment and find a life partner by bowing to a 3,000-year-old authoritarian tradition.
Leonard: What are you talking about? You married a woman you're in love with.
Sheldon: I can't believe you're throwing that back in my face.

Sheldon: Leonard, you've been losing to me in three-dimensional chess for many years. You know what would be neat? If this was some sort of long con and one day you say, "Let's make this interesting," put money on it, and reveal that you actually know what you're doing. [Leonard makes his move] A very long con indeed. Checkmate.

Sheldon: How did you get down here?
Penny: The elevator. It's really fast.
Sheldon: I-I need to be alone right now. Don't try to follow me.
Penny: All right. You need a ride?
Sheldon: That'd be great. Thank you.

Penny: No, it does matter. Okay? You were right. It was Halloween. I was dressed as a cat, you were a hobbit. It was right there on that couch.
Leonard: Why didn't you just say that?
Penny: Because I always hated that was our first kiss. I was drunk, and I was still with Kurt, and I was using you to make myself feel better. I just wanted our first kiss to mean something. That's why I said it was the one on your birthday.
Leonard: I like that. We'll make that our official first kiss.

Amy: Hey, good news. They're inviting several Nobel Laureates to our reception.
Sheldon: Oh, great, like who?
Amy: Uh, Makoto Kobayashi.
Sheldon: Ooh.
Amy: What?
Sheldon: Well, I may have been less than kind to him about his Nobel Prize win.
Amy: Why?
Sheldon: I was jealous, angry and new to Twitter. It was a dangerous combination.
Amy: Okay, so scratch Kobayashi.

Sheldon: You're awfully quiet.
Leonard: Sorry.
Sheldon: No, I like it.
Leonard: Got a lot on my mind.
Sheldon: Would you like to talk about it?
Leonard: Not really.
Sheldon: Grape Nuts for breakfast, quiet car ride, things are really breaking my way today.

Sheldon: You know we're almost finished with our paper; we just need help tracking down the citations.
Leonard: That's busywork. Can't you just get a grad student to do it?
Amy: No, this paper is incredibly important to us, and we need someone we can trust.
Please, it would mean a lot.
Leonard: You know what? Sure. The three of us in the library looking up old papers, that actually could be kind of fun.
Sheldon: Oh, no, we won't be there.
Leonard: It just got more fun.

Sheldon: When I moved to California, what did you do?
Tam: I stayed in Texas.
Sheldon: Do you believe this guy?!

Sheldon: And then you ask me 20 questions to try to determine which Nobel Prize-winning physicist I am. Ready? Go.
Mrs. Fowler: Can I give up?
Sheldon: No. 19 questions left. (ringtone playing)
Mrs. Fowler: Are you gonna get that?
Sheldon: Oh, no. We're in the middle of a game. 18 questions left.
Mrs. Fowler: Answer the phone, Sheldon.

Amy: I think you need to do some editing, like maybe cut out all that stuff about your childhood.
Sheldon: Are you kidding? Growing up in the backwoods of East Texas is what makes me warm and relatable.
Amy: Well, what about all these pages calling out everyone who said you wouldn't succeed?
Sheldon: I told them all they would rue the day. How is it gonna make me look if the day finally comes, and they're not filled with rue?

Wil Wheaton: Now's not a good time, Sheldon.
Sheldon: For what?
Wil Wheaton: You.

Bernadette: My dad and I watched you win back-to-back championships.
Kareem Abdul-Jabbar: And I watched you sniff Joe's hair when he wasn't looking.

Raj: Recently, 12 new moons were discovered orbiting Jupiter, bringing the total up to 79.
As a middle child myself, I'd like to extend my sympathies to moons two through 78. Your grandpa will never learn your name. I'd like to thank you for joining me on this journey through the stars. If you enjoyed this lecture, please come back Thursday for the exact same one.

Penny: Did-did you send this over?
Zack: I did. I asked for the most expensive one they have. They said it was $200, and I said I want a more expensive one. And then, they said it was $300.
Amy: But it-it was the same-
Penny: Don't.