What do you think is the “scariest” king book?

Title doesn’t really grasp what I mean. The most confronting. The one that hit you the hardest. The epitome of horror, in your mind. Which book f’d you up, I guess!

Mine is Cujo. The ending broke me. I have 2 little kids, so I don’t know if that’s more why. I wish I never read it, but also, I loved how it could make this impact, like I actually lived through it. Painfully and beautifully written.