9 Things You Didn’t Know About ‘The Simpsons’ (VIDEO)

25 years and more than 500 episodes later, The Simpsons is still going strong. But there are some very well-kept secrets about the show that you probably didn't know about until now. For example, does anybody know Otto the school bus driver's last name? Or which celebrities turned down an appearance? For the answers to these and other questions, may we suggest you watch the following video.