Do not occupy a urinal which means that the following person is forced to stand beside another if you can possibly avoid it. e.g. if you come in and the situation is OOOOXO, you would have to be a real prat to occupy the 2nd from the left and make it OXOOXO. The next poor bugger has to stand beside someone. You chose either the furthest left or the 3rd one from the left. Hopefully that makes sense.
It makes perfect sense. I would chose the furthest left myself.