What is the scariest film/book that you know of?

Hi all. Of late I have developed a passion for cheap thrills in the form of disturbing, thrilling, terrifying or just plain messed up media. I watches The Ring series and The Grudge, and they both have left me craving for more. I find psychological thrillers [ie ones where you don’t straight up see the scary thing] to be weak sauce, and the Exorcist, well that is just plain old.
What do you find to be the scariest?