Sheldon: It's great you're here. I'd love to get an engineer's opinion.
Howard: Sure.
Sheldon: This chair is squeaky. Now, do I fix it or get a new one?

Sheldon: How are those nipples feeling, chief?

Amy: Oh my gosh, that's the girl that broke Rajesh's heart.
Bernadette: That's Lucy?
Penny: I don't know why but I always pictured her as Indian.
Bernadette: I think that reason's called racism.

Penny: I just wanna check her out because she hurt my friend. My Indian friend. Who's racist now?
Bernadette: You! Because you just called him your Indian friend.
Penny: Yeah, well ... you're short.

Penny: See, just now you expressed your feelings to my face. How come you could do that with me but not with Raj?
Lucy: I don't know your email.

Howard: So you can never take it (the sweater) off?
Leonard: No.
Raj: Not even to sleep?
Leonard: No.
Howard: So you're just an idiot?
Leonard: It's called proving a point.
Howard: Is the point you're an idiot?

Leonard: Oh, I forgot about this (sweater). My aunt made it for me when I finished college.
Penny: Aww, did she hate you?
Leonard: Why because I got an ugly, itchy sweater and my brother got a car? No, I was her favorite!

Leonard: I'll show you what's in the box if you promise not to flip out.
Sheldon: Why would I flip out? Is it a spider? Oh, oh, it's a spider?
Penny: No, if it were a spider, Lenny would have flipped out.

Leonard: Sheldon's being reasonable.
Penny: Yeah, it's freaking me out. I'm gonna go.

Leonard: So when you say you're not going to flip out about the DVD, here's what that means. Don't fixate on it, or wake me up in the middle of the night, or nag me through the door while I'm on the toilet.

Sheldon: First, talking to you while you're on the toilet isn't exactly a picnic for me either. Remember, when you can hear me, I can hear you.

Sheldon: Arthur, I'm surprised to see your here.
Professor Proton: Yeah, me too. Somewhere around the third floor I began to see a white light.

Sheldon: Well, if you're hoping to get in touch with Bill Nye, I can't help you. I have been informed he is now Bill Nye, the Restraining Order Guy.

Professor Proton: I was thinking if it isn't too much trouble, I'd like to get your opinion about my paper.
Sheldon: Thank you, it would be an honor.
*Professor Proton hands Sheldon his paper*
Sheldon: Actually, I don't need that. I hacked into your email account and read it.
Professor Proton: What did you think?
Sheldon: First, I think the fact you use your birthday as a password is embarrassing.
Professor Proton: Thank you.
Sheldon: Second, I thought your paper was inspired.
Professor Proton: Well that means a lot to me.

Sheldon: Can I invite you in for tea?
Professor Proton: No, I really have to run .
*Penny walks in the room*
Penny: Hey Arthur, how are you?
Professor Proton: Well I guess one cup wouldn't hurt.