My only true 'phobia' is, as my friends say anyway, very unusual.
You know in the monster/disaster movies, the big crowd of unknown extras that get eaten, splattered, crushed, burned, etc.? I am terrified of being one of those.
Maybe its a byproduct of an undiagnosed superiority complex, but I am absolutely terrified, to the point of nightmares and sleepless nights, of being one of those 'statistics' if a big disaster/monster/zombie apocalypse/alien invasion hit my area. It's shaped my philosophy in life and my interests and hobbies.
(It also scared away two potential girlfriends when they discovered just -how- prepared I was for the end of the world, whatever that may involve.)