Amy: Why don't you ask me what I'm working on?
Sheldon: Oh, very well. What have you been working on? And feel free to honk during the boring parts.

Sheldon: Amy is studying the time lag between intent and awareness, and I realized that applies to the measurement problem in quantum mechanics. Now, I recognize there will be a time lag between me saying that and you Googling what it means, so I'll wait.
Leonard: I understand it, Sheldon.
Raj: Yeah, me, too.
Howard: I'm sorry, I spaced. Are we still talking about the spoon?

Sheldon: Yeah, I picked it up without thinking about it. Which raises a neuro-scientific question, when did I decide to pick it up?
Raj: The bigger question is, what are you gonna eat with that spoon? You didn't get any food.

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 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: 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.

Howard: (To Raj) If you ever want to change things up, you're always welcome here.
Bernadette: Just not in our bedroom, you dumbass.

(Leonard standing outside the door to Sheldon and Amy's apartment)
Leonard: Help! Cinnamon's loose in the building!
Sheldon: (Inside) Amy, quick, lock the door!

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.

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.

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.

Leonard: Did you know Raj moved out last night?
Penny: What? Why?
Leonard: "Leonard and Penny, I'm sorry for all the trouble I've caused. I went to stay at Howard's. P.S. Cinnamon's with me, but if you feel like messing with Sheldon, tell him she's loose in the building."

Raj: You know, we're both down on our luck. Maybe you and I should try to get a place together.
Stuart: (chuckles) Okay, listen to me. There is no reason to leave here. This is great. Everyone's nice. It's comfortable. If all goes according to plan, this is my retirement home.
Raj: Wouldn't you feel better about yourself if you were more independent?
Stuart: Better than I feel in their steam shower? I don't think so.

Raj: Don't you even feel a little bad sponging off your friends?
Stuart: Hey, look, I went to art college, I tried to make it as a graphic artist, a comic book artist, and you know what I got for my efforts? A visible rib cage. I'm not kidding. You can see my heart beating.

Sheldon: Penny would be the entree. Then Leonard's basically a cheese course. And because I love you, you're dessert.
Amy: I want to say "aw," but I'm gonna say "ew."