I never actually thought I had a phobia of anything before until I got into a U-Haul with my mother behind the wheel.
Now, don't mistake me and think that I'm afraid of my mother's driving because I'm not. At times. But for whatever reason, I have a phobia of enormous moving vehicles. I get a chill every time I pass a motorhome, vowing that when I do have children and when we all go camping, my kids are going to be cramped in the back of an eco-friendly car and they are going to like it. We will camp in a tent just like everybody else did back in the day.
I can get in a U-Haul, but I have to be either reading or listening (I choose to do both) in order to distract myself from the fact that I am indeed in a U-Haul. Don't start giving me logic; I know that U-Hauls are safe (unless, of course, one engages in a sharp turn going over fifty - if they can even get the U-Haul at fifty). I can't explain why I'm afraid of big cars and the like. I just am.
At least phobias are kind of interesting, though I would probably never use mine as a pick-up line.