Well, from personal experience letting them watch Alien at three years old is not the way to go, so scratch that one off the list. Any of the story books mentioned on the list above are great places to introduce any child interested in the genre. Other great ways are with films like Nightmare Before Christmas, which combine horror looks with musical hijinks. Then there’s the classic- It’s the Great Pumpkin, Charlie Brown! which is a staple of every Halloween.