James and the Giant Peach/Nightmare Fuel


 * In the movie, the rhino is quite scary. Even worse is the mechanical shark. Heck, the dead pirates can be pretty scary too, right at the very beginning of their scene.
 * The entire premise of the book is Nightmare Fuel. Sure, James' insect pals look sweet and cute in the illustrations, but would you like to come face to face with a human sized centipede or spider in real life? Now keep in mind that they're actually less anthropomorphized than, let's say, Disney's Jiminy Cricket who is essentially a little green-skinned man.
 * The Aunts. Don't forget the aunts.