Edna Krabappel is Bart's fourth grade teacher on the show The Simpsons.  Edna is voiced by Marcia Wallace and is portrayed as a lonely divorcee.  She previously dated Skinner, but now mostly will throw herself at anything that's remotely willing.

Edna Krabappel Quotes

Now, I don't want you to worry class. These tests will have no affect on your grades. They merely determine your future social status and financial success. If any.

Mrs. Krabappel

Bart: Mrs K, you have to get out of here. When was the last time you washed your hair?
Edna Krabapple: Hmm, two weeks ago...
Bart: Well, that's better than me, but still, you gotta get out

The Simpsons Quotes

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!

Mr. Burns: Oh, and one more thing: you must find the jade monkey before the next full moon.
Smithers Actually sir, we found the jade monkey. It was in your glove compartment.
Mr. Burns: And the road maps, and ice scraper?
Smithers: They were in there too, sir.
Mr. Burns: Excellent! It's all falling into place...