Amy: I made you tea.
Sheldon: Thank you.
Amy: I'm sorry I called you a quitter.
Sheldon: It's okay, I stopped being upset about that. And no, the irony is not lost on me.

Leonard: You are not a burden, and we want you to come back and stay with us.
Raj: But I also upset Sheldon, and he's not gonna want to come over if I'm there.
Penny: More reasons for you to stay.

Stuart: (coming into the living room) Halley's fine.
Bernadette: You know she's at my parents' house, right?
Stuart: And she's having the time of her life.

Sheldon: Things have been going really well with the infinite resistance gyroscope.
Amy: That's great. How so?
Sheldon: Oh, the project is classified. I can't tell you. Oh, I suppose I could redact the classified parts. All right, um, I came up with an elegant solution to the (honks horn). I used the (honks horn) And then I (honks horn) And that did it. (honks horn)

Amy: Why don't you want anyone to know?
Bernadette: 'Cause I'm up for a major immunotherapy study, and if they find out I'm pregnant they might give it to someone else.
Penny: Would they really do that?
Bernadette: I know they would. They did it to Barbara Chen last year when I told everyone she was pregnant.

Raj: You know, downward-facing dog comes from the Sanskrit phrase adho mukha shvanasana.
Penny: Oh, that's beautiful. What does it mean?
Raj: "Downward-facing dog."
Penny: Yeah, I guess they don't have Sanskrit for "butts up and heads down."
Raj: Hey, we wrote the Kama Sutra. If it involves butts, there's a word for it.

Leonard: I thought we were getting breakfast before work.
Penny: Oh, right, sorry.
Raj: It's my fault. I asked Penny to do yoga with me.
Penny: If you want, I can get ready in five minutes.
Leonard: (chuckles) It's cute that you think that.

Raj: Hey, can I ask you a favor? Would you mind taking Cinnamon for a walk?
Leonard: Sure. You're living here for free. I guess I owe you.

Leonard: I mean, they didn't say anything, but I just kind of felt like I was being a weird third wheel.
Howard: Huh, so you can tell what that feels like. Interesting.

Amy: Sheldon, is it possible that when things get really difficult, you just give up?
Sheldon: Are you calling me a quitter?
Amy: Well, if you honestly-
Sheldon: This conversation is over.

Amy: So, shall we get to work?
Sheldon: Biology and physics coming together. This is like the peanut butter cup of the mind. Ooh, I know what I want my treat to be.

Raj: So, why did you guys even agree to the deadline?
Howard: We didn't. Sheldon did.
Raj: And you just let him?
Leonard: Well, the colonel said it was for the good of the country, and the funding is substantial.
Howard: No, but mostly, there was an awkward pause, and I broke it by saying, "Okay."

Penny: Okay, how is that?
Raj: I can actually feel the toxins being pulled out of my skin.
Penny: Well, this is a moisturizing mask.
Raj: Oh, well, then I can actually feel the moisture going into my skin.

Amy: You know, we've never collaborated professionally before. Are you worried it might affect our relationship?
Sheldon: That is a valid point. Perhaps we should establish some ground rules.
Amy: Well, that would make me feel better.
Sheldon: All right, let's start right now. Uh, rule number one, no using sexuality to get your way.
Amy: That's a ridiculous rule.
Sheldon: Is it? (Sheldon flaunts his posterior as he walks away)

Leonard: Should we go bring him back?
Penny: Well, you're the one worried having someone live with us is a sign of problems.
Leonard: Oh, that was just because my mother got in my head. It's like being possessed, but instead of Satan, it's -- Actually, it's the same thing.