Bartholomew "Bart" Simpson is voiced by Nancy Cartwright (that's right, a woman!) and is Homer and Marge's only son on The Simpsons.  Bart is an underachiever and was definitely much more of a bad boy in th ebeginning seasons of the show.

Now, Bart, although he has not aged, has certainly matured as a character.  Do the Bartman people.

Bart Simpson Quotes

Bart: Otto-Man? You're living in a dumpster?
Otto: Ho, man, I wish. Dumpster-brand trash bins are top-of-the-line. This is just a Trash-Co waste disposal unit.

Bart: Uh, say, are you guys crooks?
Fat Tony: Bart, um, is it wrong to steal a loaf of bread to feed your starving family?
Bart: No.
Fat Tony: Well, suppose you got a large starving family. Is it wrong to steal a truckload of bread to feed them?
Bart: Uh uh.
Fat Tony: And, what if your family don't like bread? They like...cigarettes?
Bart: I guess that's okay.
Fat Tony: Now, what if instead of giving them away, you sold them at a price that was practically giving them away. Would that be a crime, Bart?
Bart: Hell, no!
Fat Tony: Enjoy your gift.

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!

You know, you remind me of a poem I can't remember, and a song that may never have existed, and a place I'm not sure I've ever been to.

Grampa