What scares you?
I wouldn't say I have any phobias really. When I say phobias I mean the kind that stop you from doing things; that are so powerful that they actually have a physical as well as mental affect on you. However I do have things that "concern" me.
For instance windows and doorways. I know it sounds silly. But I cannot sleep if the bedroom door is open. In fact if I'm left alone at home for a night I will make sure all the doors are closed. Similarly when I lived with my family if I was left alone for a weekend (as I was, gloriously, very often) I would ensure all the curtains in the house were pulled... all day long. I cannot stand the idea of windows. I hate looking out of them (if I want to see the outside... I can go outside) and I hate the very idea of someone looking in on me (especially at night).
One of my worst childhood memories is sleeping in an old monastery, on the ground floor with NO NET CURTAINS. Just window. And darkness. *shiver*
I really must overcome this, as it's a little silly. Last night I was watching Supernatural and one scene had a clown standing at a window... it was too scary for words...