Nelson is one of the least known (yet most popular) characters in the amazing TV-series called "The Simpsons". He lives in the bad neighbourhood, in a crappy house, and we don't get to see his parents very often. The only couple of times we get to see his dad, is when he coaches the school soccer-team in the episode, "Brother from the same planet", and when Nelson stole Bart's "superbelt", when he beats Homer up. We've actually seen his grandpa once too, in "the Curse of the flying Hellfish", who is a court-judge who has sent lots of people to death, and Nelson's very proud of him.

He's a student(?) in Bart's class, but he doesn't care of studying. Most of the time he only sits in class and makes fun of the other pupils, with his worldwide-known phrase: -HA-HA. His friends are Bart, Jimbo Jones, Dolph, and Kearney, although he kicks the crap out of Bart sometimes... In the episode where Lisa is supposed to marry an Englishman, we get to see Nelson in the future, and he has got a son who also yells "HA HA".

Probably the most embarrassing moment in Nelson's life was when he was being forced to parade down the street with pants pulled down to ankles, in front of the whole town (episode 3F18, 22 short-films about Springfield).

Some of Nelson Muntz's quotes:

We've been doing a lot of upper body work on Bart. Today let's pound his kidneys

[On the movie "Naked Lunch"]
I can think of at least two things wrong with that title!

Check it out, a freezer geezer!

In my dreams, I'm a viking!

Hey, that hurts. No wonder no one came to my birthday party.

Lisa: [reading] "Nuke the whales?" You don't really believe that, do you?

Nelson: I dunno. Gotta nuke something.