I don't know how weird or not this is, but if there's a list or group of items together, I feel the need to either arrange them by size/shape or in alphabetical order.
All my CDs have to be in alpha order. My refrigerator is usually organized by size/shape. My dresser drawers are organized by weight of the clothes: first drawer has panties/bras, second drawer socks and pantyhose, third drawer has tank tops and t-shirts, 4th and 5th drawers has shorts, sweats and jeans.
Oh, and I have to be the one who cleans the bathroom. I don't trust anyone else to do it right. If I do it, I know it's clean. That makes me happy. Weird probably, but it's the little things that matter, amirite?