All guys know the rule, if your standing at the urinal....eyes forward. There is to be no looking around. It is something we learn instinctively when were little (at least no one ever told me the rule. I just knew).
Some guys take this extremely seriously. A guy in New Zealand actually punched a guy, not once but twice in a Pub's bathroom for not following "Urinal Etiquette." This actually went to court!

