Futurama is one of the greatest animated shows of all time. Bender, Fry and the rest of this universe may also be a great example of what can go wrong with one of modern medias most talked about trends, the retcon. While the best Futurama episodes all stand the test of time, one was changed, and not for the better. If you know anything about a waiting dog, you might be one step ahead. Sometimes the best media can magnify what works and what doesn't within a medium, Futurama is one of those pieces of media.