This interesting site allows you to anonymously share exactly how neurotic you are with the entire internet. If you are OCD I suggest not visiting this site as it will give you a lifetime worth of tics to dwell on. It didn’t take too long for me to find one that I could relate to:
All of the keys on my ring have to have the flat side facing the same direction. If I get a new key and realize I put it on wrong, I will drop whatever I’m doing at that moment no matter what, trying to get the key off and turn it around the right way.
In addition, My keys are on my ring in order of size (length).