In December I was riding the A train downtown, and there was a guy across from me tearing up garbage and mail and whatnot and scattering it all over the floor around him. He then pulled out a bottle of lotion, rubbed it all over his hands and then stuck his hands down his pants and started playing with himself for about five minutes, before screaming and freaking out. Then he lit a cigarette and started looking around the train at everyone and cackling, stretched out on the seats, finished his smoke and went to sleep. That's absolutely true.
Also, about two months ago there was a guy sleeping across from me, also on the A train, who woke up, walked over to the doors (which were closed since we were moving), and started peeing. But I guess he wanted to be polite, since he sort of cupped his shirt and was peeing into that. Of course the pee was sloshing around and making puddles and also soaking through his clothes. A couple of girls who I took to be tourists were screaming and freaking out about it, naturally. But I actually felt sort of bad for the guy, because he seemed kind of embarrassed, and like I said before polite in a really weird way.