Harry Potter and the Philosopher’s Stone was first published in the UK in 1997 and one year later in the US. In no time, children and adults alike fell in love with the books and pretty soon, Harry Potter was a household name. The book series came to an end in 2007 with the seventh and final novel, Harry Potter and the Deathly Hallows.

Millions of dedicated fans have read these books over and over. They have studied every detail, created family trees and relationship charts, found hidden meanings and dissected minor characters. These fans come up with some of their own ideas about the true nature of the wizarding world. Keep reading to have your mind blown.

J.K. Rowling confirmed one major theory about Hermione

Lilly Potter Owned Crookshanks Before Hermione

In the third book in the Harry Potter series, Harry Potter and the Prisoner of Azkaban, Hermione adopts a rather temperamental cat named Crookshanks. Hermione absolutely loves her new pet, but Ron isn’t so fond of the creature. Ron even accuses Crookshanks of eating his pet rat, Scabbers.

Fans have theorized that Crookshanks actually used to belong to Harry’s mother, Lilly Potter. When Hermione buys Crookshanks from the Magical Menagerie, the owners of the pet shop tell her that the cat had been there for “quite some time.” Also, Crookshanks seems to recognize both Peter Petigrew and Sirius Black in their animagus forms.