Urine is a funny word to say. Therefor urine (peeing) is ment for funny things. Peeing in a toilet is a waste of pee. The best place to pee is outside however bathroom walls, sinks,showers and out windows will do just fine.
(pissing on your passed out friends so that they think that they pissed themselves is immature and makes you a retard. So if you do this go buy a short bus ticket to Gofuckyourself)