Much like a game of chess. When 5 urinals are present and male 1 takes the first urinal. Male 2 then comes along and takes the urinal 3 spots down so male 3 canot piss if they respect the Urinal Rule. Checkmate
Male 1: Dammit i was Urinal stalemated today!
Male 2: Oh wow thats dog man.
Male 1: I know! If only he wasnt a douchebag.