Slightly off topic, but I am constantly astonished to see all the Harry Potter books in Children's sections of bookshops, often the young kids section, not just young adults.
A good few 10/11 year olds must get nightmares after reading Deathly Hallows! In one late scene, Voldermort tortures the much loved Neville Longbottom, by putting the Sorting Hat on his head, then setting it on fire, as Neville screams in pain, for example. The film is OK, because they pretty much removed and desenitised any horror from all the books.