Penny: Now, when he said "make a baby" is it possible he meant out of Legos?
Amy: No. He was explicit. Needlessly and freakishly explicit.

Leonard: Why does he need a baby? He's already hairless and smells like talcum powder.

Penny: Could you two really have some sort of super-intelligent child?
Amy: Well, there is a genetic component, but that doesn't guarantee anything.
Leonard: That's true. Sheldon's father once picked a fight with a cactus.
Penny: Yeah, but that's just his Earth parents. We don't know anything about the ones that sent him here.
Leonard: Well, we know they were smart enough to send him away.

Amy: Hey, you're talking about the person I love and have been avoiding for the past three hours.

(Amy, Leonard and Penny reach the fourth floor and discover Sheldon has laid out rose petals leading to the door of Apartment 4B)
Amy: Aww, man!
Penny: Ooh! Sheldon gonna get some.
Leonard: Well, have fun with whatever nightmare's behind door number two.

Sheldon: Would you look at that? The image we gave it was 45% white noise, and it still managed to reconstruct it.
Amy: I've never seen results like this before.
Sheldon: Yeah, we need to stop for magnets on the way home; this is going right on the fridge.

Amy: Make a baby? What are you talking about?
Sheldon: Clearly the combination of our DNA is exceptional. Our child could be the next step in the evolution of mankind. We we'll be able to get into any preschool we want!

Sheldon: Hey, where are you going? Did you even look at my bottom?

Raj: We're in the telescope room! It'll be like dining under the stars. You see this, uh, double zero? When it says "01" that means it's twinkling. ... Sometimes it takes a while.

Raj: I tried to cook you a meal from your homeland.
Issabella: Oh, really? You made Cuban food?
Raj: That depends. Do they have Mexican food in Cuba?

Raj: This is fun. I have never cleaned a toilet before.
Issabella: You're kidding.
Raj: No, I grew up with a house full of servants and now I have a cleaning lady ... who is a lovely woman who I have great respect for.
Issabella: It's okay, you're allowed to have a cleaning lady.
Raj: Oh, good, because she also walks my dog, buys my groceries and cuts my hair.
Issabella: I think that's called a mommy.

Raj: So, forgive me forgive me for being nosy, but is there a wedding ring under those pretty rubber gloves?
Issabella: No, not for many years.
Raj: Oh, so, you are unencumbered?
Issabella: Just me and my son.
Raj: I love kids, how old is he?
Issabella: Nineteen.
Raj: That's a cute age. They can do so many things.

Issabella: Good night, Rajesh.
Raj: Okay, I'll leave. But just know, every time I come in here, I'll be thinking of you.

Sheldon: Yeah, this little guy can already recognize electronically transmitted images 20% faster than any other sample in Amy's lab.
Bernadette: I'm running out of ways to act excited.

Amy: So, enough about us, how are things going with you?
Bernadette: Great, the doctor said the baby's head is facing down now.
Amy: Good, you know, in case the exit isn't clearly marked.