Howard: I got pretty exciting NASA news today. Next week I fly to Houston for orientation and zero-gravity elimination drills.
Penny: What does that mean?
Bernadette: He's gonna to learn to poop in space.
Howard: Open the pod bay doors, HAL.
Raj: Maybe your nickname should be "Brown Dynamite."

Leonard: Sheldon, Canada is not going to invade California.
Sheldon: Yeah, really? You think those hippies in Washington and Oregon can stop them?

Astronaut Mike Massimino: No problem, Froot Loops.

Leonard: Oh, great! I get to spend another night in front of our apartment dressed like one of the Village People.
Sheldon: You make that joke every three months and I still don't get it.

Mrs Wolowitz: Howard, your Froot Loops are getting soggy!

Sheldon: Rise and shine sleepy head, half the town probably is dead.

Sheldon: It took me a gallon of urine to get that water!

Sheldon: Uh oh, hypothetical aftershock. (Sheldon grabs Leonard and pushes him over) And that's why we wear hard-hats.

Penny: Anyway, you want to make out?
Leonard: I thought because our relationship was in a beta test, you wanted to take things slow?
Penny: Okay. Do you want to make out slow?
Leonard: I can go so slow. It'll be like there's a snail in your mouth.

Leonard: I have to get a lock for my door.

Sheldon: Power failure. Implementing power-failure protocol.
Leonard: What happened to all your glow-in-the-dark-emergency-exit stuff you had painted on the floor?
Sheldon: Oh, that was wildly carcinogenic. Anyway, it's too bad you’re no longer entitled to the full benefits of my friendship, because I happen to be extremely prepared for such an emergency. Please try not to see anything by this light. It's not for you.
Leonard: It's just a blackout, I'm sure the power will be back on soon.
Sheldon: And I'm sure some fool in the Donner party said the snow would stop any day now. I like to think they ate him first.

Leonard: Fine, what is it?
Sheldon: I'm making s'mores. I wanted to alert you in case you smelled caramelizing marshmallows and thought a nearby candy factory was on fire.
Leonard: S'mores, huh? Good for you.
Sheldon: Yes, or good for us if you sign here and reinstate the full roommate agreement.
Leonard: No, thanks. I'm good.
Sheldon: Really? Huh! Okay. In that case, I will have a s'more by myself. And then I'm gonna have s'more. By myself.

Sheldon: Excuse me, Leonard.
Leonard: Since when don’t you knock? It's like the only good thing about you.
Sheldon: Social niceties have been suspended, Leonard. We're in a state of a emergency. The world has descended into darkened turmoil. Lawlessness and savagery are the order of the day.

Leonard: Listen, Sheldon, this is stupid. I don't see why we can't be friends. And I'm willing to drive you around and help you out with stuff. I just don't want to do it because of some silly roommate agreement.
Sheldon: What are you proposing?
Leonard: That we go back to the way things were. But when I do something for you, you show a little appreciation.
Sheldon: And how would I do that?
Leonard: You say thank you.
Sheldon: Every time?
Leonard: It's not crazy.

Penny: Oh, good, your power's out, too.
Leonard: Why is that good?
Penny: Because last month, I sent the electric company a Starbucks gift card, an apology note, and a few snapshots of me in a bra.