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: Hey, Mom. Did you save Dad's love letters?
Marge: Of course I saved them. Well actually, there's only one. It's more of a love postcard from some brewery he visited.
Homer: Maybe it's the beer talking, Marge. But you've got a butt that won't quit. They've got these big chewy pretzels here (undecipherable slurring) five dollars?! Get outta here!
Bart: Wow, the side of Dad I've never seen.

Bart and Lisa: (Singing dull) Hot dogs, Armour Hot Dogs.
Grampa: Sing it like you mean it!
(Grampa plays harmonica and the kids sing it with style.)
Bart and Lisa: What kind of kids eat Armour Hot Dogs?
Bart: Fat kids.
Lisa: Skinny kids.
Bart: Kids who climb on rocks.
Lisa: Tough kids.
Bart: Sissy kids.
Milhouse: (Sticks head from the window.) Even kids with chicken pox love--
Family: Hot dogs, Armour Hot Dogs.
(Grampa stops playing harmonica.) The dogs kids love to bite!
Lisa: Doesn't this family know any songs that aren't commercials?
(Everyone except Lisa starts singing the "Chicken Tonight" jingle.)

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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: Aw, twenty dollars? I wanted a peanut!
Homer's Brain: Twenty dollars can buy many peanuts.
Homer: Explain how!
Homer's Brain: Money can be exchanged for goods and services.