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.

Penny: You know, I'm very proud of you for trying to live with Amy.
Sheldon: Oh, thank you. Of course, the ideal way to conduct this experiment would be with four pairs of identical Sheldons and Amys. One pair that was neither dating nor living together. One pair that was dating but not living together. One pair that was living together but not dating. And then, of course, one pair that was living together and dating. Although, with that many Sheldons, it'd be such a party, we'd never get anything done.
Penny: That was a cute story.

Penny: So, uh, what did you want to ask me?
Sheldon: Well, you've lived with your significant other for some time. I would like this experiment to go well. Are there any insights you can share?
Penny: Mm. Well, the biggie is, if she has an insane roommate, kick him out as soon as possible.
Sheldon: You know, Leonard and I were very happy before you came along.

Amy: You've been roommates with Sheldon forever. Do you have any advice?
Leonard: I'm trying to think of an answer that won't stop you from doing this.

Sheldon: How many pairs of underwear did you pack for the move?
Amy: I don't know. I didn't count.
Sheldon: You truly are the Goofus to my Gallant.
Amy: That's me.

Amy: Well, if you're nervous about the sleeping arrangements, maybe we should talk about it.
Sheldon: Okay. Talk.
Amy: Well, I imagine one of your concerns might be coital expectations.
Sheldon: Wow, no foreplay or anything, just right to it.
Amy: Look, I know this experiment is a big step outside of your comfort zone. So why don't we take being physical off the table and maybe later on, once we're more settled in, we can revisit it.
Sheldon: You're really okay with that?
Amy: I've never lived with someone, either. This is a lot for me, too.

Sheldon: Enjoy having the place to yourselves.
Leonard: You enjoy your mission to boldly go where no man has gone before.
Sheldon: It's Penny's bedroom. Plenty of men have gone before.

Sheldon: Oh, don't forget. Tuesday the air filters need to be changed.
Penny: Yeah, you wrote it on my hand.

Sheldon: Oh, and every other day, check the water level on the avocado pit.
Leonard: I'm on it. Fifteen years from now, we'll make guacamole together.

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?

Amy: Sheldon, will you please just pick a side?
Sheldon: Fine. Okay, now, on this side, I am closer to the exit in case of emergency.
Amy: Great. That's your side.
Sheldon: No, but I'm also closer to the entrance in case of attack.
Amy: Okay, I'll take that side.
Sheldon: Ah, then again, what are the odds of someone attacking me?
Amy: Rising rapidly.

Sheldon: Now, this side offers me proximity to the bathroom, but I am closer to the window where perverts can watch me sleep.
Amy: Okay. What if we do this? (Amy closes the drapes)
Sheldon: I suppose that works.
Amy: Great.
Sheldon: Although now I'm kind of worried someone's hiding behind those drapes.

Bernadette: This is ridiculous. The doctor knows what the baby is, the ultrasound tech knows, Raj knows, his Grey's Anatomy online fan group probably knows.