Penny: Maybe I'll just eat this in the laundry room.
Sheldon: No, no. Wait. You don't have to go, as long as you sit quietly and don't say anything.

Leonard: So, I think if we want to predict the height of the wave, we need to use elasticity theory and model the lattice as one continuous flexible piece.
Amy: This is fun.
Leonard: Mm-hmm.
Amy: Playing with Popsicle sticks, exploring ways to store kinetic energy. It's like preschool all over again.

Leonard: Except now if I eat paste, it's because I want to, not because Craig Schultz is making me.
Amy: Hey, can I ask you a question?
Leonard: Is it, "Where was the teacher?" She was in the bathroom smoking, that's where.
Amy: It wasn't, but I'm glad to see you've moved on.

Amy: I was gonna ask if being married felt any different.
Leonard: Oh, uh, not really. Sorry. That probably wasn't the answer you were looking for.
Amy: No, actually it is. I mean, Sheldon and I are in a really great place right now, and I just, I don't want anything to mess that up.
Leonard: Mm-hmm. You do remember you're here because he kicked you out of your apartment?
Amy: Yes. His work is important to him. It's one of the things I find the sexiest about him. Well, that and-
Leonard: Aah! [setting off the lattice]
Amy: - his butt.
Leonard: Ugh.

Sheldon: And then I was thinking about inventing a new dark matter particle to evade the omega baryon constraints, but that just seems like something anyone could come up with.
Penny: Mm. Agreed. You know what's blowing my mind? Somebody thought about putting cheese in this crust.

Sheldon: I just wish I could find something that excites me.
Penny: You do understand that crust doesn't normally come with cheese in it?

Penny: What got you excited about dark matter in the first place?
Sheldon: Well, I left string theory, which I'd been working on for a long time, and everyone was talking about how cool dark matter was, and I thought, "€œWell, sure, I'll give that a whirl".
Penny: So it's your rebound science?
Sheldon: What's that?
Penny: Well, not the science you spend the rest of your life with, but the one you use to make yourself feel pretty again.

[Howard playing keyboard in bed with headphones, making a clacking noise]
Bernadette: What is happening?
Howard: I was trying not to wake you.
Bernadette: Did it work?

Howard: I just realized, now that I'm not in the band, I can focus on my own music. You know, go solo.
Bernadette: You said you were taking a break from the band to help with me and the baby.
Howard: Yes, and write an astronaut musical. Picture this. The curtain opens. There's a lone astronaut floating in the inky blackness of space. Maybe wires, maybe fog. I'll let the director figure that out. [playing the keyboard] "I really don't know when I'll run out of oxy gen".

Howard: Good news! I'm back in the band!
Raj: So, Bernadette doesn't mind?
Howard: It was her idea!

Penny: So it's sort of like a guitar string, but instead of making an actual sound, each vibration is a different particle?
Sheldon: Precisely. And when you express it in 11 dimensions, Einstein's relativity equations pop out. Does that sound like a coincidence?
Penny: It does not.

Penny: So, so, did we do it? Did we just solve string theory?
Sheldon: Oh. (laughs) I appreciate your enthusiasm, but this is not the sort of thing we can figure out in a night. People have been stuck on this for decades.
Penny: What, decades? Really? It's-it's a string. How hard can it be? It's straight, it's in a loop, it gets knotted up with other strings.
Sheldon: Well, actually there are no knots in anything greater than four dimensions. Ooh, unless we get around that by considering them as sheets. You know, topologically speaking, that has a lot of interesting possibilities.
Penny: See? How long did that take me, like a minute?

Raj: Toby, today you are a man, and you will face many obstacles in life.
Bert: And some of those obstacles are gonna feel like boulders.
Howard: This first song is about the greatest boulder in the history of cinema.

Amy: Oh, Leonard.
Leonard: Sorry, I just, I had to get out of there.
Amy: What did he do now?
Leonard: Nothing. He's being a dream. Don't give me that look. That's how Penny looked at me. I'm not crazy.

Amy: Penny and I have the same "You're crazy" look? That's kind of sweet.