I think you're describing the NYC subway. Last time I took a bus (not by choice), a drunk guy who smelled like microwaved broccoli pissed all over himself in the back. This wasn't just any piss. This was like, he'd held his piss for 10 years, and waited for this particular bus, just to piss on it. Ever play the floor is lava? This was let's play the floor is piss.