I don't consider myself OCD, but I do have a few "Quirks" as someone else called it. Mostly having to do with how I eat a specific food item or how certain chores are done around the house.
The dishwasher has to be loaded exactly right, with silverware sorted and everything in it's specific place. I don't let anyone else load the dishwasher. My husband loves this rule.
When I eat my eggs over-easy, I eat all around the yoke and when every reachable part of the whites are gone I break the yoke and start tearing the crust off my toast to sop it up. Toast gets eaten the same way, crust first then the inside.
I also have the color and type coding system in my closet. Also things usually go back into the closet after they've been washed into the same exact location it was in before. I know exactly where to reach for something I'm looking for.
Before I get into bed the blankets and sheets have to be just right. All of the layers have to match exactly and be just the right width going down the side. If it gets dissarrayed for whatever reason before I got to sleep then I have to get out and totally remake the bed.