Sheldon: Wow. I anticipated we'd have problems, but I never thought your scientific rigor would be one of them.
Amy: I'm sorry, are you questioning my integrity as a scientist?
Sheldon: If the lab room disposable shoe cover fits.
Penny: Was that a science diss?
Leonard: Yeah.
Penny: Was it a good one?
Leonard: Meh.

Amy: What would a theoretical physicist understand about an experiment anyway? I mean, you wouldn't know a confounding variable if two of them hit you in the face at the same time! And you don't even get that joke, 'cause you don't even work with confounding variables!

Sheldon: So, how is everyone?
Amy: Miserable and exhausted.
Sheldon: Really? I slept great.
Amy: Well, I didn't, and it's your fault.
Sheldon: How? You had the whole floor to yourself.

Bernadette: Are we being silly not finding out the sex?
Howard: Yeah, I was just thinking the same thing.
Raj: If you want, you can find out right now.
Bernadette: Hmm. The doctor's gone for the day, so it doesn't matter.
Raj: Or somebody else knows because they saw it in the folder.
Bernadette: You looked in our folder?!
Raj: It was an accident. The doctor left the folder out on her desk. It's not my fault I opened it and looked.

Howard: So you know the sex of our baby, and we don't?!
Raj: Flip a coin. You got a fifty-fifty shot.

Raj: This is not a problem, okay? If you don't want to know, I don't have to tell you.
Bernadette: We don't want you to know!
Raj: Okay, well, that's a problem.

Sheldon: Which side of the bed would you prefer?
Amy: Doesn't matter to me. Your choice.
Sheldon: No, no, we're living together now. Everything's equal. I know that I have a tendency to be controlling, so I would rather you choose.
Amy: Well, Sheldon, I really appreciate that, but these things mean more to you than they do to me, so whatever you want.
Sheldon: Well, clearly, it's not whatever I want, because what I want is for you to make this decision, and you refuse to do that.
Amy: Well, I'm not refusing. I'm just trying to be considerate.
Sheldon: Like when you let me get those shoes with the wheels on the bottom, and then watched me roll right into traffic?

*Leonard using his inhaler*
Penny: I told you not to do the worm.
Leonard: (out of breath) You were right.

Amy: I don't think I slept two minutes last night.
Penny: Yeah, get it, girl. It's not what you think.
Leonard: I feel like I pulled something. Why didn't you tell me to stop?
Penny: Even more not what you think.