The most scared I was was about 4 years ago I was driving back to chicago from the upper peninsula of michigan. I was on I-43 between Green Bay and Milwaukee and we experienced a "white out". I couldn't see past my wind shield. I couldn't stop because of fear of someone hitting me and I hoped that the road didn't turn so that I would end up in a ditch. I couldn't pull over because I couldn't see the road. Truly a frightening experience, for me. Something I've never experienced before and hope I never experience again. My knuckles were white from gripping the stearing wheel so hard.
Other than that, I was watching the "Exorcist" alone one night, probably 15 years ago and started hearing strange noises in the house. I turned the tv off and went to bed scared. LOL
Aaargh! Just looked at my unshaven visage in the mirror, the horror the horror...
I don't believe in ghosts or any of that supernatural malarkey but one incident that I've mentioned before, was when I was young alone in my bedroom trying to sleep, I heard a noise in the room, was too terrified to turn the light on, than I felt something pressing down on me, I was sinking into the mattress, could hardly breathe, after what seemed like an eternity the pressure was suddenly gone and I jumped out of bed, switch the light on, nothing there, I was near petrified, was it a dream? dunno, it felt very real, I just couldn't move, what the hell was it?
Somehow, trying to cut through the woods between my next door neighbor's house and my own one time when I was eight (we're talking 50 feet), I got myself lost and wound up a mile away.
Part of why I loved The Blair Witch Project - they really showed how completely terrifying it is to be lost in the woods.
When I ran off the highway while racing a friend and did a couple of 360's through the grass median before ending up on the other side of the highway pointed in the wrong direction.
I wasn't really scared, but when I was filling out the papers for our marriage license, I suddenly got a bit of a panic attack. I was just sitting there, and I couldn't remember my birthday or anything. My wife looks over, and tells me the date. That's me, cool under fire.
Then, there was this time when I was 18 (I think maybe 19) when a girl and I that had "relations" were sitting in the bathroom waiting to see the device in her hand turned pink or yellow. A very terrifying minute of my life.
Then there was the time when I was at my girlfriends house when I was about fourteen. You know that kind of girlfriend. The kind you watched movies with in the living room while her parents were there, and all you ever really did was hold hands. Well, we were holding hands (and watching Carrie....somehow I remember that very vividly) when my little fellah decided to hop up and check out the situation. She is on one side of me on the couch, and her mom was on the other side of me. Sounds pretty sweet for a porn, but I almost shit my pants out of fright. And it didn't go away for quite a few minutes.
So, looking up, I guess I can summarize by saying I'm most scared anytime I'm around a female.