Definately Invader Zim! The dark humour in this show is absolutely priceless

runners up

Justice League-- 2 parter action done right. No short one episode stories and amazingly well done
Family Guy-- only show thats ever really made me laugh outloud
Batman animated series-- a classic
Berserk-- brutal medievil anime. disturbing ending, but still amazing
Rurouni Kenshin-- sword swinging anime set a century ago in Japan
GTO-- perverted anime about a wannabe teacher who is an ex-gang member and a letch
He-man-- the latest incarnation. suprisingly enough i liked this a lot, especially the last ep. where King Hiss accidentally ate his own head
Fist of the North Star-- crazy 80's anime about a martial arts master roaming the planet after a nucleaur holocaust who goes around blowing peoples heads off with his special fighting technique
Gargoyles-- loved this

"Now TV's all about format these days isn't it, and I've got a new type for you right here. Its me and Paris Hilton driving around in a car.... Now I know what you're thinking, but she's in the boot!" "So you see, 'Ring around the Rosey' refers to the horrible symptoms of a terrifying disease, a disease which.....a disease which....ZIM! Theres a Pigeon on you're head. You have 'Head Pigeons'. get to the Nurse before they spread to the other children." "Get off my lawn Cookie Beast!" --Invader Zim