With a show this good, people naturally want to add to it, and many come up with their own episodes, songs, people, places and inventions. When they do this, it's called "fan fiction". If they draw a picture that's inspired by the show, it's called "fan art". Since the goal of this wiki is to be as accurate as possible based on what's seen in the episodes, we need to keep fan fiction separate. Fan art is discussed further on the fan art page.