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

Wow, now I see why they call you Miss Hoover. You must have been vacuuming for an hour.

Bart

Homer: Girls are easy. Girls love daddy. Girls make birthday cards with glitter on them. Girls can marry a hockey player and get me free tickets to hockey games. Girls don't steal my lines. And girls never ask me how their body works because I have no idea.
Bart: You never told me how my body works.
Homer: Point and shoot.

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