User blog comment:Cheese Lord/What Is So Scary About Smile Dog???/@comment-4113837-20120116211024

I guess it's the image itself, It's an abnormal shape with human features. It's the sort of thing you see in the bathroom mirror or at the end of a hallway when you have to get up in the middle of the night. After all, your brain is wired up to detect faces, and that grin is really effective at materialising in everything when your in the dark.