Leonard: Thought you were getting us dinner.
Penny: Sorry. I had to stop at Sheldon's and help him solve string theory.
Amy: What?
Penny: Yeah, turns out the answer's knots.
Leonard: That's cute, but you can't have knots in more than four dimensions.
Penny: Mmm ... you can if you consider them sheets. [chuckling] Good night.

Penny: You know, you compared us to the strangest couple we know, and we know Amy and Sheldon, Howard and Bernadette, Raj and his twitchy little dog.

Sheldon: This reminds me of a traditional Amish barn raising. With everyone pitching in.
Howard: How exactly are you pitching in?
Sheldon: I don't hear anyone else giving facts about traditional Amish barn raising.
Leonard: The rest of us are pitching in with hammers and nails.
Sheldon: Well, facts are my nails, and my voice is the hammer which pounds them through the wood of your skull.
Penny: Well, that is how it feels.

Sheldon: All right, I've kept you in suspense long enough. "Dutch" is a bastardization of the word "Deutsch," meaning German.
Penny: What's German for "annoying"?
Sheldon: Nervig. Why do you ask?

Penny: No, it's not that.
Bernadette: Then why?
Penny: Honestly, I don't know if I'm up to it. You know, the last project I managed was my high school yearbook.
Bernadette: And?
Penny: And that was the year we didn't have one. - And? And that was the year we didn't have one. Apparently, the printers won't make them without getting paid.
Bernadette: What happened to the money?
Penny: Uh, if I didn't know then, I'm not going to magically know now.

Leonard: Penny, Steve Wozniak was one of the co-founders of Apple computer. He and Steve Jobs.
Penny: Yeah. I know who he is. I watch Dancing With the Stars.

Penny: Oh, anyways I'm also writing a screenplay. It's about this sensitive girl who comes to LA from Lincoln, Nebraska, to be an actress and who ends up a waitress at the cheesecake factory.
Leonard: So it's based on your life?
Penny: No, I'm from Omaha!

Penny: I need to go back to dating dumb guys from the gym.

Leonard: So I'm like a bran muffin?
Penny: What? No, that's not what I'm saying.
Leonard: No, that's exactly what you're saying. I'm the boring thing you're choosing because I'm good for you.
Penny: What does it matter? I'm choosing you.
Leonard: It matters a lot. I don't want to be a bran muffin. I want to be a cinnabon, a strawberry pop tart. Something you're excited about, even if it could give you diabetes.
Penny: Sweetie, you can be any pastry you want.

Leonard: So is that it? Are we engaged?
Penny: Yeah, I think so.
Leonard: All right.
Penny: What's wrong?
Leonard: I'm not sure. It just feels a little anti-climactic.
Penny: Yeah, it kinda does, doesn't it?

Bernadette: We'll take you to the mall to get it done.
Penny: Why? I can do it right here.
Amy: Really? You have a piercing gun?
Penny: No. All you need is a needle and an ice cube. I've done it, like, a dozen times.
Amy: Oh, I don't know.
Penny: Oh, come on. I'll be gentle. Let me take your ear virginity.
Bernadette: This party's weird.

Penny: Ooh, these are cute. Of course if I buy them, I'll have to rent my womb out to a gay couple.

Penny: I promise next time I get married, it won't be a joke. It will be for love ... or money.

Sheldon: When I was a little boy and got sick, which was most of the time, my mother would read [The Monkey and the Princess] to me. It's about an Indian princess who befriends a monkey who was mocked by all the other monkeys because he was different. For some reason I related to it quite strongly.
Penny: I know the reason.
Leonard: We all know the reason.

Penny: I don't understand, exactly how did he get any friends in the first place?
Howard: We liked Leonard.