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

Lisa's Brain: Poor predictable Bart. Always takes 'rock'.
Bart's Brain: Good ol' 'rock'. Nuthin' beats that!
Bart: Rock!
Lisa: Paper.
Bart: D'oh!

Puppets: Duff beer for me, Duff beer for you, I'll have a Duff, you have one too! Duff beer for me, Duff beer for you, I'll have a Duff, you have one too!
Bart: I want to get off.
Selma: No, you can't get off. We have five more continents to visit.

The Simpsons Quotes

Lincoln, Lincoln. I've been thinkin'. What the hell have you've been drinkin'? Is it water? Is it wine? Oh, my gosh. It's turpentine!

Bart & Lisa

Yep, here's your problem. Someone set this thing to "Evil."

Repairman