I obsess over little silly things.
My keyboard and mouspad must be in exactly the right position in order for me to use them; my ashtray has to be in it's "spot"; my desks work area must be arranged just right; I can't STAND a dirty bathroom; etc.
I would LOVE for my house to always be shiny clean, but realize that when it is I become psycho about keeping it that way. I seriously become hard to live with because every little thing that's moved or left out sends me into a rage.

So if it's only passable I don't mind other people messing it up as much.