Wow, 20 years of the Simpsons. It is not only the longest running cartoon on TV, but the longest running show,
EVER. You have to be impressed, whether you are a fan or not. They come up with decently original shows, and even when they run with popular culture, it is hilarious. I believe that some of it's success is it hires many, many different writers, instead of beating the same old horse to death.