Icefeather31 is going off the movie the Neverending story which is completely different from the book. In the book when Bastian goes to Fantastica, the world in the never ending story, all of his wishes can come true but with every wish he loses a memory. If you run out of memories you can't go home and you wander around Fantastica forever not even knowing your name.
Well, in the movie 'never ending story' it had a kid reading it meaning world destruction for the world inside, then having to save it at the end, then going on a random untold adventure were it only showed the "beginning" with the reader riding a flying gigantic dog beast at some average young around (i think 12 or 13 year olds, not sure) kids who were mean to him. So i guess harassing bullies and riding a gigantic dog beast through the city is bad. (even if epic)
I forgot that The Never Ending Story is confusing as hell. I remember that gigantic dog-thing saying that it was a dragon (or at least that world's version of a dragon). That thing was flying around in Manhattan and nobody noticed, seriously. Necronomicon is still a lot more dangerous universally tho.