SouthPark "Pee"

voice acting, story are the important elements to make this animation so successful

http://en.wikipedia.org/wiki/South_Park

South Park is an American adult animated sitcom created by Trey Parker and Matt Stone for the Comedy Central television network. Intended for mature audiences, the show has become famous for its crude language and dark, surreal humor that lampoons a wide range of topics. The ongoing narrative revolves around four boys—Stan Marsh, Kyle Broflovski, Eric Cartman and Kenny McCormick—and their bizarre adventures in and around the titular Colorado town.

The pilot episode was produced using cutout animation. All subsequent episodes are created with software that emulates the cutout technique. Parker and Stone perform most of the voice acting. Since 2000, each episode is typically written and produced during the week preceding its broadcast, with Parker serving as the primary writer and director. There have been a total of 237 episodes over the course of the show's sixteen seasons.

Parker and Stone developed the show from two animated shorts they created in 1992 and 1995. The latter became one of the first Internet viral videos, which ultimately led to its production as a series. South Park debuted in August 1997 with great success, consistently earning the highest ratings of any basic cable program. Subsequent ratings have varied but it remains one of Comedy Central's highest rated shows, and is slated to air through at least 2016.^[4]