We must question your actions as well. You could have CHOSEN a stall. Instead, you chose a urinal, which means you accepted the possibility that there was a 50% chance that another man would stand next to you. You could have avoided all of this by choosing a stall.
Perhaps deep down inside you yearned for another man to stand next to you will you peed.
But let's break down those probabilities further, though.
Are the odds of a straight man picking the adjacent urinal truly 50%, when the far one is unoccupied?
I would submit that amongst a respectful and normally functioning male population, that probability rate should drop to approximately 5%, to account for the lapse in judgement that may happen.
So now, amongst the deviants who like pee, that rate probably goes up to 90%. But how much of the general population fetishizes water sports?
This is indeed a statistical case worthy of the guys at MIT to expand upon. I think there's meat on the bone here...