Principal Petersen: George, you don't mess with a winning streak.
George: So as long as we're winning I'm stuck with this guy?
Principal Petersen: That's right.
George: What if we lose?
Principal Petersen: Then you're gonna get murdered by a guy wearing a pink cowboy hat.

Sheldon: You wanted to see me?
Principal Petersen: When don't I want to see you, Sheldon? Come in. I have something I'd like to give you. This is a key to the faculty restroom. No students allowed. One person at a time. And unlike the other restrooms, this one gets cleaned every night.
Sheldon: Thank you.
Principal Petersen: No, Sheldon. Thank you.
Sheldon: You're welcome.

[on the "Why Sheldon Cooper Should Go to College" tape:]
Principal Petersen: A student like Sheldon comes along... once in a lifetime. This school is not gonna be the same without him. But I know he's gonna do great things. And I'm honored to have been a small part of it.

George: Hey, Tom, you got a minute?
Principal Petersen: Pretty busy. Make it quick.
George: It turns out I don't need that raise.
Principal Petersen: What happened, you win the lottery?
George: No, no.
Principal Petersen: Aw, George, I am so sorry.
George: Well, what can you do?
Principal Petersen: Listen, I cleared your raise already, why don't you just keep the money.
George: Oh, no, I couldn't do that.
Principal Petersen: No. No, I mean it. It's yours.

Dr. John Sturgis: Well, sometimes people assume, because of my age, that I'm out of touch, that I, uh, don't know how to use new technologies, that I, uh... Hold on, there's a third one.

Sheldon: My parents are being completely unreasonable. They won't even let me drop out of school. And even after I told them that Bill Gates and Steve Jobs both dropped out of college.
Dr. John Sturgis: What did they say?
Sheldon: They said, "We don't care what your friends do, you're not dropping out."
Dr. John Sturgis: Well, Sheldon, I know it's disappointing, but, uh, I think they just have your best interests at heart.
Sheldon: They said that, too.
Dr. John Sturgis: And for every Bill Gates and Steve Jobs, there's a Paul Labiscous.
Sheldon: Who's that?
Dr. John Sturgis: Exactly.

Sheldon: No one will even listen to my ideas. I'm being discriminated against because I'm too young.
Dr. John Sturgis: I'm sorry to hear that.
Sheldon: I can't wait till I'm your age and people treat me with respect and reverence.
Dr. John Sturgis: Sometimes older people get discriminated against, too.
Sheldon: For what? Getting smaller and cuter year after year? Look at you.