Sheldon: I always tell people, if you have only one day in Los Angeles, make it a train day.
Raj: "Train Day?"
Sheldon: The fun starts with brunch at Carney's in Studio City, a hot dog stand in a converted railroad dining car. Next stop, Travel Town, an outdoor museum featuring 43 railroad engines, cars, and other rolling stock from the 1880s to the 1930s. Then finally, we're off to the glitz and glamour of Hollywood, for dinner at, that's right, the Hollywood Carney's, a hot dog stand in a different converted railroad dining car.
Raj: I don't think we're gonna do that.
Sheldon: Well, then apparently, you hate fun.

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.

Leonard: I'm sorry.
Raj's sister: Why do you say that?
Leonard: When I'm in bed with a girl, that's just my natural response.

Raj: Hands off my sister.
Sheldon: Why would I touch your sister? She's all covered in airplane germs.

Sheldon: And to think, I was about to waste the last of my good haemorrhoid cream on you.