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: Moe, look over there! (as a distraction)
Moe: What? What am I looking at? I don't see nothing. I'm gonna stop looking soon What? What, is that it?
Homer walks into Moe's Tavern
Homer: Hey Moe, can I look, too?
Moe: Sure, but it'll cost ya.
Homer: My wallet's in the car.
Homer runs out
Moe: He is so stupid. And now back to the wall.
Bart: The burglar even took my stamp collection!
Lisa: You! Had a stamp collection!? (everybody laughs *phone rings*)
Nelson: Stamp collection!? Haha!