I was scared to death of heights, still am. And snakes...still am! Was afraid of those dang outhouse bathrooms...always was afraid as a kid I would fall in.
The biggest fright I had was once "seeing" a demon during a migraine. Now, I was about 6, so I can't tell you whether it was actually a bad entity or simply part of the migraine, or the entity causing the migraine. I can tell you the fear was real and primal. I was praying and crying for several hours. One of the scariest encounters of my entire life.
I had a whole list of lesser fears for a bit there, but have managed to overcome them.