5. Dumbledore admits he is a cheap Gandalf Knockoff.
4. Sirius Black goes down fighting 13 Death Eaters, and takes out 12 before tripping into the mirror.
3. And some point Harry Potters gets slapped and told to stop be-atching.
2. It is moe than hinted at that Umbridge was raped by Centuars.
1. Instead of Umbrige, a real WH40K inquisiter is put in charge of Hogwartz. Instead of malfoy and his buddies, Blood Angels are braught in to cleanse the school of desent.
One last thing, I forgot to mention, crappy books don't become uber popular. In fact, Harry Potter is the ONLY fantasy sci-fi (besides Tanith) book I read made post 1990's.