This one always killed me, as well! http://www.videosift.com/video/Weird-Al-Im-fat
I think it's actually supposed to be titled "Fat" rather than "I'm Fat" though. No biggie, right?

You ain't fat! You ain't nothin'!! You ain't NOTHIN'!!!!!!!!!!

Tags for this video have been changed from 'weird al, music video, im fat' to 'weird al, music video, im fat, fat, bad, michael jackson, parody' - edited by Issykitty

(cont'd chat... when it got interesting again)

Stranger: ya silly talk, change the topic....
You: you im lazy
You: and fat
You: so fat
Stranger: why don't you loose some of it? there are millions of chemicals in the market
You: like crack
Stranger: nice taking to you.keep up chicken sex. i'm going
You: is it because im fat?
Stranger: may be but the night is falling and i've to go home
Stranger: but if you want you can give any of your e-mailing add.
You: no thanks
Stranger: then i guess its gud bye
Stranger: gud bye
You: *good dear, good
Stranger: you don't think we japanese can have good english, do you? well let me say that only one thing that if we were to give any english test right now then i'll surely get more marks than you
You: marked wrong
Stranger: so have fun with your life
You: my life is fun
You: im not from japan
Stranger: ya big fat fun with fats and stiches
You: what?
You: oh you meant *yeah
Stranger: don't make me count your mistakes
You: oh i wasn't counting love. I was fixing
You: counting has numbers in it
Stranger: ok why don't you fix your obeseness first
You: my what?
You: oh yeah, i forgot that I am fat
Stranger: think about it
You: yes I surely will
Stranger: p.s: i'm not japanese
Your conversational partner has disconnected.

i refuse to eat KFC but...
im pretty sure im fat because ive been eating birthday cake, birthday cake batter and frosting for 2 days.

" oh boy oh ya gee, ah ha haha, Jimmy Im fat , im old and I am just plain not good looking or wise to be one tv, why am I here ? "

Sorry this is a dupe: http://www.videosift.com/video/Weird-Al-Im-fat