F U R R I E S
More specifically, fursuits. Yes, really. I believe its the same reason so many people are afraid of clowns. The fact that you can’t see their real face triggers an uncanny valley effect. Even extends to school mascots. Saw one walking down the hall and I immediately turned around. (Though oddly enough, I’m fine with clowns.)
Also used to be afraid of the possibility of telepaths. Now, obviously, I didn’t actually believe there are people with mind powers among us, but the primal part of my brain was disturbed by the concept of having my private thoughts invaded.
Oh, and Jupiter. That planet freaks me out, man. It’s the only one that has its own Eye of Sauron starring back.