I think the reason many people are afraid of the dark is because they fear the unknown.

I always get the feeling that I'm being watched from someone out there in the dark, so it is sort of a double whammy with the being afraid of the dark/watching thing.

I won't open the blinds because I'm afraid there won't be someone there (I know VERY lame).

I also have this weird fear of clowns, maybe because of "It".