I'm scared of bathrooms. They're like a combination of everything bad, with the mirror there, and the shower curtain, and what have you. Something horrible always goes wrong in a bathroom in every movie.
In my family's old apartment, we had a really leaky bathroom. there was a small closet in the corner for towels and the lock was broken so the door never shut. I think it was just the towels inside reflecting back light but whenever I looked at it from the corner of my eye, the door was always half open and there was something bright glimmering back at me.
To make it worse, one of my biggest fears though is seeing something in a mirror (IN THE BATHROOM) and turning around to find nothing there. Or mirrors in general, they just freak me out. I can't stand to be in the dark with a mirror. It probably has some connection with all those Bloody Mary games you hear about.