Seriously. That demo was the only thing that has actually made me jump in terror since I was about 10, and it made me do it TWICE. It may be a cat-scare type of thing, but dammit, it works. The part that Gravedigger mentions is particularly great. You basically look away for a split second to start going down the ladder and you look back and she's just right THERE. I swear I thought I was gonna fall off the ladder, then I realized that it was just a game. Powerful stuff.