Is there anything more disturbing

Than being the first into a gents toilets (at least 4 separate urinals), doing the correct thing and choosing one of the corner urinals only for the next person coming in choosing the urinal next to you?

You's basically pi55ing next to a future axe murderer aren't you 

In a four urinal bank the correct etiquette is as follows

person 1: 1 or 4

person 2: whichever of 1 and 4 is left

person 3 onwards: use an open trap unless 1 or 4 is free

the only permissable exception to this is at the rugby where the sink may be treated as an extra trap