Crazy Yet Reasonable Harry Potter Fan Theories

Harry Potter fans have several crazy theories about the world and characters JK Rowling created.
One example, is the theory that 'Harry Potter Is Now Immortal.'
Another is that Harry Potter was mistreated by the Dursley's because he was one of Voldemort's horcrux.
Finally, another is that Neville Longbottom wasn't terrible at magic he was just given the wrong wand.