Penny: Can I just see what he wrote on the napkin?
Bernadette: What napkin?

Sheldon: You know, spending time with Michael and Halley today really made me think about our future children.
Amy: Huh, what an interesting and completely unforeseen development.

Amy: What are you thinking?
Sheldon: Well, I just can't decide. Either five sets of triplets or three sets of quintuplets. You know what? It doesn't matter as long as they're healthy. And divisible by three.

Amy: That's a lot of babies, Sheldon.
Sheldon: Oh, only for humans. For frogs, it's just a drop in the bucket.
Amy: Well, I'm sorry I'm not a frog.
Sheldon: Oh, don't feel bad, Amy. You're good enough for me.

Amy: I guess we should go and let Howard get them ready for bed.
Sheldon: Yeah. Do you think he'd let us come back and do some more?
Amy: Maybe we could take them to the park.
Sheldon: Smart. There'll be more babies. It's a bigger sample size.

Raj: Where are the kids?
Amy: Oh, Sheldon's helping Howard give them a bath.
Raj: Hmm. So you really think you can trick Sheldon into liking babies?
Amy: I slept with him. I married him. You want to bet against me?

Sheldon: Well, you were right, Amy. There were so many valuable experiments to perform on them during bath time.
Amy: You don't say.
Sheldon: I do. I tested their object permanence with a rubber duck, and we took a run at Archimedes water displacement, but that went right over their heads.

Leonard: Just tell me the truth, Mother. Was my whole childhood just one big experiment?
Beverly Hofstadter: Of course not, dear. It was thousands of small experiments.
Leonard: So that's all I was to you, a-a test subject?
Beverly Hofstadter: No, you were my baby and I found you fascinating.
Leonard: Really?
Beverly Hofstadter: Yes, watching you develop, tracking your progress. I know I'm not the warmest of parents, but it was time we spent together, and, honestly, those are some of my fondest memories.
Leonard: When did you stop?
Beverly Hofstadter: Oh, I can't tell you. The experiment isn't over.

Danny: Zangen's a fine company. They got a couple of good drugs, but we control 60% of the market. Hell, commissions on just our fungal creams will put you in a new Mercedes.
Penny: Danny. Danny, look at me. Does this face sell fungal creams? No. This face is cholesterol drugs and above.
Danny: Playing hard to get, huh?
Penny: [laughs] No one's ever accused me of that before.

Danny: Look, why don't I just give you a number and see what you think?
Penny: Ooh, are-are you gonna write it on a napkin and slide it over to me?
Danny: No, I was just gonna say it.
Penny: Aw.
Danny: Do you want me to write it on a napkin and slide it over to you?
Penny: Yah.

Sheldon: It's so funny, we did all these experiments on them and they didn't even notice.
Amy: I know, I was worried it would be obvious, but it wasn't.

Bernadette: Danny, you rat bastard.
Danny: What? I'm just making your friend an offer.
Penny: Yeah, he's writing it on a napkin like in the movies.

Bernadette: That's not an offer. Do you know how amazing this girl is?
Penny: Aw. You think I'm amazing?
Bernadette: Stay out of this.

Bernadette: I can't believe you took his business card.
Penny: I can't believe we're still talking about this. He handed it to me. What was I supposed to do?
Bernadette: Hand it back to him and tell him to stick it where the sun don't shine.
Penny: You are not serious.
Bernadette: Serious as the hepatitis their cholesterol medication gave thousands of people.
Penny: Did it?
Bernadette: Maybe.

Bernadette: Don't be so naive. They're our number one competitor. They have a rival drug coming out with a name I wish we thought of. Forsootha. It's got "soothe" right in it. How did we miss that?