But then, I've started thinking about fear. Scary creatures in movies, stories, and pictures mostly have these things in common: Pale white, long faces, messed up/no hair, black empty eyes or none at all, long teeth, and claws. To help you know what I'm talking about, I'll post these 3 images (yes they are creepy, you don't have to click on them if you don't want to. Just remember that it's an ancient instinct pumping adrenaline through your body, and that they're photoshopped.

Can't get the images to work. I'll fix'em later.
Same thing with ghosts. Why do they scare people? They're just transparent humanoids who float around and moan.
What happened, deep in the hidden eras before history began, that could effect the entire human race so evenly as to give the entire species a deep, instinctual, and lasting fear of pale beings with dark, sunken eyes, razor sharp teeth, and elongated faces?