There was a silly little game that I saw in the late 90's that was a 'test' of just this poll (a little point and click thing, like a mini-IQ test). It offered you a number of different scenarios, all empty, 1 dude, 2 dude, spaced, together, big dude, little dude, all that - and on the final 'test' the correct answer was 'turn around and walk out'. All but the pisser by the door were occupied and the #2 unit had a huge dude user.
I can't believe I found a forum thread about that. I think the correct answer for this is #3 - you might get surrounded sure, but at least your not next to the door where odd things can happen...IMHO...
UMP