Principal Petersen: I would love to, Sheldon, but there's a district rule that says a principal can't live next door to a student.
Sheldon: That makes sense.
Principal Petersen: Does it? Good.

[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.

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.

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.

Ms. MacElroy: That's sweet of you for asking, but I'd rather stick my finger in a pencil sharpener and crank away.

Tam: Why are you reading about property code?
Sheldon: The house next door to mine is for sale, and I'm looking for ways to control who moves in there.
Tam: When my family moved to Texas, they burned our fishing boat.
Sheldon: Tam, we're talking about my problems right now.
Tam: We usually are.

Sheldon: There's no telling who could buy that house! What if they have dogs? What if they have birds? What if they have both and the birds learned to bark like dogs?
Mary: Sheldon, you're gettin' yourself all worked up.
Sheldon: For good reason... that house is six feet away from my bedroom window. Who knows what kind of smells could jump the gap? Uh, cigarette smoke, a scented candle, a durian?
Mary: What's a durian?
Sheldon: A vile-smelling fruit of the genus Durio.
Mary: When did you smell that?
Sheldon: I haven't, and I'd like to keep it that way.
Mary: It might be nice. It might be a family with kids your age.
Sheldon: I already live with a kid my age... not a fan!