The Rugrats is a great example of animation that is all about believablity. For the show to be successful, the audience must believe that the children who are aged between two to five years old, can talk like adults and have serious conversations. Although the show is ment for children, the children and possibly adults must believe that this is real and accept it.
In the trailer above, we see that the children get lost in the woods and must find their way out. This is complete nonsense and would never happen to chilren in real life, especially with the series of events that they go through. The movie is sucessful and people accept the fact that it is believeable.
Scooby Doo is another cartoon that relies on the audience being able to believe and accept the fact that this is real in the cartoon world. In Scooby Doo, we have a dog that can nearly speak, and goes around with a gang of friends, helping to solve crimes that the police cannot. The gang always accidentally stumble across these crimes and mysteries, which is completely unrealistic. But for the cartoon to work, the audience have to accept this. Below is random clips of Scooby Doo, in which you can see the cartoon is unbelievable but relies on the audience to believe it for it to work.