Penny: What's the matter?
Sheldon: Um, well, I was worried that you might be missing Leonard. And that might be causing you to have bad dreams, like the kind you'd get if you watched Clash of the Titans right before you went to bed.
Penny: Sweetie, did you have a bad dream?
Sheldon: To be honest, I did.
Penny: Aww.
Sheldon: Back to the Future II was in the Back to the Future III case. Leonard did it.

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.

Amy: It would be nice to be with a man who wants to know what's underneath my cardigan. FYI, it's another cardigan.

Sheldon: As rock and roll bad boy Paul Simon once said, "I am a rock. I am an i.....sland".

Raj: Who died and made you the king of moments?