Like, minor compulsions. Nothing like OCD. Small things, like repeatedly checking that the back door is locked, or that your bed is perfectly made. I'll admit to things like that.
I'm pretty picky about how the dishwasher and the dish drainer are stacked. It's Tetris, but it annoys the daylights out of me when I go into the kitchen in the morning and see clean dishes sprawled across the counter top, drying from the night before. Learn to stack, people!