A "mind-blowing" Harry Potter fan theory claims that Hagrid is closely linked to the Death Eaters and he might even be one. It's no secret that Rubeus Hagrid is a key character within the Harry ...

I solemnly swear that I am up to no good' The era of the Harry Potter ... invisible ink' which can only be seen under black light. Brilliant. And also a rather good idea if you don't want your HP ...