Amy: It's kind of exciting. I mean we could do whatever we want.
Sheldon: But what if we move and we don't like it? What if there's a smoker in the building? Or pets? Or there could be mold. There could be traffic noise.
*Amy humming the theme from Star Trek*
Sheldon: I'm gonna have to learn a whole new bus route. Are you trying to soothe me by singing the Star Trek theme as a lullaby?
Amy: Yes.
Sheldon: I'm not a child, don't do that.
Amy: Sorry.
Sheldon: Do you know 2001: A Space Odyssey?
*Amy humming "Also sprach Zarathustra*
Sheldon: All right, now that's soothing.

Raj: I don't like bugs, okay. They freak me out.
Sheldon: Interesting. You're afraid of insects and women. Ladybugs must render you catatonic.

Sheldon: Scissors cuts paper, paper covers rock, rock crushes lizard, lizard poisons Spock, Spock smashes scissors, scissors decapitates lizard, lizard eats paper, paper disproves Spock, Spock vaporizes rock, and as it always has, rock crushes scissors.

Sheldon: Why are you crying?
Penny: Because I'm stupid.
Sheldon: That's no reason to cry. One cries because one is sad. For example, I cry because others are stupid, and that makes me sad.

Sheldon: Oh, I don't mind, I'm very good at complaining. If it were an Olympic sport, I'd complain about what a stupid sport it is and then I'd take home the gold.

Leonard: Superman's gone. My stormtrooper's gone.
Sheldon: Your Klingon word-of-the-day calendar's gone.
Leonard: I'd say "damn it" in Klingon, but that wasn't until next month.
Sheldon: It's "khoo-vakh".
Leonard: Khoo-vakh!

Leonard: Sheldon, this is not a big deal. It's a little white lie, everyone does it.
Raj: Not me, I'm a 100% honest in all of my relationships.
Howard: And how single are you right now?
Raj: Eating-cake-on-the-toilet single.