Sheldon: Dear Lord, you're an astronomer. Although you may have earthly woes, get your mind back on the stars. Gee, even the lowly dung beetle chooses to plot its course by using the Milky Way.
Raj: Is that true?
Sheldon: Everything I say is true. Now, of course, the dung beetle also enjoys eating feces, living in feces and making little balls out of feces, so, you know, pick and choose which aspects of its lifestyle you want to embrace.

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?