Leonard: Sheldon, it's not a great time. What do you want?
Sheldon: (on the phone in the apartment) Hello to you, too. I'm sorry, but this is important.
Leonard: What is it?
Sheldon: Back to the Future II was in the Back to the Future III case, and Back to the Future III was, get this, in the Back to the Future II case.
Leonard: So?
Sheldon: So, did you do that, or am I in the house with an intruder?

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?