i once had this somewhat unnerving experience. i was taking a moderately long bus ride (only about an hour or so, but it seems awfully long this time), and i sat about halfway back on the right side. everything seemed normal at first, until i actually looked around and observed the people around me. lets see, clockwise from my left: man clutching a ratty plastic bag, peering at everyone very suspiciously, like we all wanted to steal it. in front of him, there was a man who, i swear, was talking to his wallet. i had a good view of him, he had no phone, not even a hands free, and was talking directly to his wallet. in front of him, a guy sitting crosslegged on his seat rocking back and forth in a very exagerrated way. across the aisle, there was this woman who was the most depressed looking creature ive ever seen, staring morosely out the window. next to her, chatting away in a very animated fashion and totally oblivious to her, was some man. didnt seem to notice she wasnt paying the slightest bit of attention to him. behind them, in the seat in front of me, was a man staring intently at the shiny side of a dvd. i wouldnt have thought him particularly odd, except that he turned out to be a chatterer, who talked my ear off about how his landlord and the local government was out to get him the whole damn ride.
for a while i was seriously worried i had jumped on the wrong bus and was on my way to the local mental hospital. but no... i got where i was going, a little exasperated, but with no problem... this is just the state of the city i live in.....
edit: yeah, i forgot to mention that, aside from the driver and myself, these were the only people on the bus. it was eerie...