Marriage can be difficult enough without the added stress of a shared bathroom. The bathroom can be the hill upon which the marriage war is either won or lost. It's such a personal space, and if your bathroom habits are different from your (messy, inconsiderate, raised-in-a-barn) spouse, real trouble can arise.
Enter this list of rules one husband taped to the bathroom mirror for his wife. This guy took the time to express his views on the bathroom situation with his wife, who is (sorry) an absolute slob, at least when it comes to this one room. He complained of suffering from "Bathroom Surprise Anxiety," never knowing in exactly what state (of affairs, not of the country) he'd find it.
He decided to make a list of rules, specifying where things should be put and how covers can go back on things after they've been taken off.