Leonard: Priya and I are both adults. We didn't betray Raj.
Sheldon: In fact, you did, but I was referring to Howard.
Leonard: What are you talking about?
Sheldon: April 12th, 2005, Bobs Big Boy, Toluca Lake. Raj had just introduced us to Priya for the first time, and she was enjoying the sweet taste of Hindu rebellion in the form of a Bob's Super Big Boy hamburger. In order to preserve your friendship, you and Howard made a pinky swear that neither of you would attempt to woo her. I had a patty melt.
Leonard: Okay, fine, I betrayed Howard.
Sheldon: And Raj.
Leonard: Alright, and Raj.
Sheldon: And me.
Leonard: You?
Sheldon: Violation of the roommate agreement, overnight guest notification clause.

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.