Penny: Sheldon, do you want to sleep here tonight?
Sheldon: Oh, as small as Leonard is, I don't think the two of youd be comfortable on the couch.

Leonard: What do you want?
Sheldon: It's not what I want, it's what evolution wants. Human beings are primates. Primates have evolved to live in groups, both for protection and support.
Leonard: But you don't like other people.
Sheldon: I do tonight. It's scary over there.
Leonard: It's getting scary here, too.

Penny: Umm. Three little kittens? Three little pigs? God, I don't know. Star Wars?
Leonard: Did we win? Can we go to bed?
Sheldon: Good Lord, I could not have made this easier. Hydrogen atom, H. Plus, pigs minus pea, Higgs. Bow, General Zod trapped in the Phantom Zone. Bow-zone. Pear. Tickle. Pear-tickle. Higgs Boson Particle. How could you not get that?
Leonard: He's right, Penny. It's all there.

Penny: Look, Sheldon, sweetie, I know you're feeling insecure, but we've really got to go to sleep.
Sheldon: All right. I'll take the first watch and wake you at 0400.
Leonard: Great. Good night.
Penny: Wait, wait, what's 0400?
Leonard: 4 am.
Penny: That's, like, in 45 minutes.
Leonard: Just keep walking.

Leonard: Don't you think looking for a new city to live in is a bit of an overreaction?
Sheldon: Our apartment was broken into, our security system tried to kill me, and as a result, I'm leaving Pasadena forever. Tell me how that's overreacting.
Penny: Come on, Sheldon, you can't move. Don't you need to stay in one place so the mother ship can find you when it returns?
Sheldon: Oh, if that were only true. Unfortunately, as I'm earthbound for the foreseeable future, I need to find a location that's more hospitable than the mean streets of Pasadena.

Sheldon: All right, Boone, North Carolina. Every summer since 1952, Boone has hosted an outdoor amphitheater portrayal of the life and times of its namesake, Dan’l Boone. Sounds like something that would attract the wrong crowd.

Howard: Hey, look who's back!
Sheldon: Interesting. The acquaintance is the first to greet me.

Penny: Toad of truth? Is that a physics thing?
Leonard: No, that's a crazy thing.

Howard: I understand your point, but given a choice Jews always go with Chinese food.

Leonard: We're going to Switzerland to see the CERN supercollider. And ski. We'll also go skiing.
Penny: We're going skiing in Switzerland?
Leonard: Well, you'll ski, I'll fall. But yeah, we will be in Switzerland for Valentine's Day.

Penny: You actually put that in an agreement?
Leonard: Yeah. We also put in what happens if one of us wins a MacArthur Grant, or if one of us gets superpowers, or if one of us is bitten by a zombie.
Sheldon: He can't kill me, even if I turn.

Howard: That's not true. My happiness is not dependent on my best friend being miserable and alone.
Raj: Thank you.
Howard: Although, I'd be lying if I said it wasn't a little bit of a perk.

Sheldon: This is incredible! I'm so happy, I'm not even going to question their judgment in picking you. I'm just going to run home and start packing.
Raj: Why wouldn't you take Penny?
Leonard: I am taking Penny.
Raj: Oh. Well, then I anticipate an awkward situation when you get home.

Leonard: Sheldon, you got a minute?
Sheldon: Of course, my good friend. Come in. Help me out, which ski hat says aprs supercollider?
Leonard: Sheldon, I'm not taking you to Switzerland.
Sheldon: Well, of course you are. Who else would you take?
Leonard: Penny.
Sheldon: What? That's absurd. Penny has no interest in subatomic particle research.
Leonard: Yes, but it'll be Valentine's Day. We can go sightseeing and skiing and make love in front of a roaring fire in the shadow of the snowcapped Alps.
Sheldon: But Penny has no interest in subatomic particle research.

Leonard: But it does involve air travel. Okay, um, let me slice this Swiss cheese with my Swiss army knife, and then you can wash it down with a cup of Swiss Miss instant cocoa.
Penny: Okay, I'm starting to think Swiss is key here.
Leonard: Uh-huh.
Penny: We're going to Disneyland and ride the Matterhorn?
Leonard: How does that involve air travel?
Penny: We're going to Disney World and ride the Matterhorn?