Toy Story
It's tough to pick just one entry in the franchise, so we'll go with the one that started it all. In addition to being the first feature film done entirely in CGI, the movie was also the calling card for Pixar. It set the tone for the movies to come: funny, smart, honest, and unwilling to pander for cheap or blue laughs. Toy Story is a kids' film that can be enjoyed by adults not because of its vaguely suggestive content, but because it's just that entertaining.