Principal Skinner: You're not supposed to be able to get outside our network.
Nelson: You shouldn't have made your password, "password".
Principal Skinner: It was the name of the street I grew up on, Password Drive.

Willie: What's that?
Principal Skinner: We didn't want to leave you out of the digital revolution. Willie, meet your new supervisor.
Willie: I have to take orders from a machine?
Principal Skinner: Oh it can't speak, but should it ever learn, yes.

Skinner: So from now on our cafeteria will only serve delicious Stuffwich's heroes, hoagies, and torpedoes.
Nelson: What about po' boys?
Skinner: Sorry, Nelson. Poor boys, such as yourself, will go hungry.

You're like egg salad at a picnic, Simpson. Even when you look good, we know you're going bad.

Principal Skinner: I must say, Lisa, it was amusing to see you thoroughly de-high-horsed.
Lisa: That isn't a word.
Principal Skinner: Oooh, back on the saddle she climbs.

It's called precipitation because it never fails to precipitate bad behavior.

Bart: Looks like Mr. Vanilla just grew some chocolate chips.
Seymour: Save your analogies for the analogy portion of the exam.

Chalmers: I hate waiting. That's why I hate risotto.
Skinner: Even mushroom risotto?
Chalmers: What do you think?!?

We can handle the alcoholism, melted cheese in the microwave and, selling A's for cigarettes, but not laying a hand on a child.

That theremin has paid for itself time and time again.

Milhouse: Lisa, if I don't make it back, there's a letter in my locker I want you to read.
Lisa: I've already read it.
Principal Skinner: We've all read it.

Lisa: I've got something! The sixth grade security camera shows three empty desks.
Principal Skinner: Enhance!
(Camera zooms in on desk with "Skinner Stinks" carved into it)
Principal Skinner: De-hance! De-hance!

The Simpsons Quotes

One trick is to tell 'em stories that don't go anywhere, like the time I caught the ferry over to Shelbyville. I needed a new heel for my shoe, so, I decided to go to Morganville, which is what they called Shelbyville in those days. So I tied an onion to my belt, which was the style at the time. Now, to take the ferry cost a nickel, and in those days, nickels had pictures of bumblebees on 'em. "Give me five bees for a quarter," you'd say. Now, where were we? Oh yeah, the important thing was I had an onion on my belt, which was the style at the time. They didn't have white onions because of the war. The only thing you could get was those big yellow ones..

Grampa

Homer: (Wearing glasses) The sum of the square roots of any two sides of an isosceles triangle is equal to the square root of the remaining side!
Man: (From inside a bathroom stall.) That's a right triangle, you idiot!
Homer: D'oh!