I read this some where that The Flinstones and The Simpsons are the only cartoons in Television history to get a large number of adult audiences. Is this true?

Well,those and these:
Crusader Rabbit-the first TV cartoon
Gerald McBoing Boing
Rocky and Bullwinkle
Yogi bear
Top Cat
Jetsons
Johnny Quest
Mr.Magoo Famous Adventures, though most of it was a mistake to cast Jim Backsus lovable old coot in these roles...I mean come on! Magoo as Genghis KAHN!! Seriously?? If he tried to make a Mongolian barbecue...I shudder to think..shoe polish and sholeaces.....Gerald McBoing Boing (he was UPA as well) and the stereotypical Chinese houseboy would sue for stomach cramps!(yeah I know this was the serious version)

ANd many MTV cartoons have an adult audeince..come to thionk many HB and Ward carotons of the 60s were very adult oriented!