Not animated movie. Just cartoon's. Series or one offs. i can see most people saying The Simpsons but I adore :
It's childish enough for the kids to enjoy but it has an underlying subversiveness that adults enjoy too.
Other faves:
Duck Dodgers In The 24 1/2th Century.
Dungeons and Dragons.
Trap Door.
Battle Of The Planets.
Roadrunner.
...and don't tell me you don't watch them-everyone does! Anything out there that I may have missed? I keep meaning to get into Family Guy but never seem to get around to it.