I have a terrible one that everyone makes fun of me for: I hate water in my face. My roommate in college noticed it when I was washing my face...I can't splash water in it. I freak out. If I'm in the pool and I get some water on my face, I'll swim to the edge and have a towel there to dab my face... It's bad.
I also wait for a few stairs to go by on a down escalator, I hate them.
When playing Trivial Pursuit, I make sure everyone's pieces are put in their pie in the correct order. If someone puts it in wrong, I immediately take out the piece and put it in the correct spot.
Also, I don't like things in costume. I make exceptions for Disney characters, but I don't like people dressed up otherwise. Halloween=terror. Santa=scary. Easter bunny=horrible. Oh, and even a mariachi band in a Mexican restaurant freaks me out... I know, I'm weird, ok?