Heights, specifically while climbing. But I rationalize that one since I fell 20' once while rockclimbing in Cuba. I still try to climb every now and then, but I get the shakes and lose all grip strength once I get higher than about 6'...
Fear that the movie Number 23 is about me. Long before that movie came out, I had a fixation with 23 and 32, the radio volume must be at either one, or a complex variation of the addition/subtraction of 2's or 3's of that number.
I also, cannot watch the roulette wheel, I look away from the time the dealer spins to the time the dealer announces the number.