Beavis and Butt-Head
Beavis and Butthead is an animated comedy show that aired originally on MTV from 1993 to 1997. It was created by Mike Judge, who later went on to write and produce King of the Hill (spot the Hank Hill prototype!). As of this writing, MTV and its viewership seem still unaware that Judge was making fun of them.
The format of the show involves Beavis and Butthead watching music videos and making lewd, often sexist comments. Stories are advanced in between videos and targets for their carnal humour include authority, high school life and even themselves. Somewhat ironically, Butthead is the smarter of the pair.
A full length movie, Beavis and Butthead Do America was released in 1996.
Beavis and Butthead along with other (arguably) mainstream cartoons such as Ren and Stimpy and the The Simpsons pushed the boundaries of cartoons away from clean material for small children only. While crude in the extreme, it offered succinct social commentary and a disturbingly accurate portrayal of life in America for many.
Along with the usual merchandising, a comic was released and at least one video game. A spinoff show based on their maligned classmate Daria Morgendorfer, Daria was also created.