Oh, I guess I could tell a whole bunch of public transportation stories too - being the bus guy for the greater part of my life. In fact, I sometimes believe, there's only a couple of types of human beings actually using public transport:
o The teens: They seem to hate walking nowadays.
o The revoked-drivers-license-guy: Sits on the places facing backwards to be able to stare at every girl entering the bus.
o The junkie: No money, but in need of a warm place for a fix.
o The granny: Never got around doing the drivers license (no need when pops was still around).
o The ethno: Doesn't sit down, but likes to block the whole place with his bicycle
o The mom with her kids: Has time and it's an experience for the kids.
o The business guy: Rather works than trying to impress someone with his fast car.
o The refugee: Isn't paid enough to get a car.
o The Bus Guy: Does it for his own little social studies, and because he's a firm believer in saving earth by not using his motorcycle. (Plus, he's a small business guy :-)

Luckily, people will only sit next to me when there's no other possibility. They tend to look at me, hacking away something on my box, decide that the sound of my keyboard is too much for a whole ride, and stick themselves into the crowdy 3-people compartment.
(Lesson for today: Macs are sweet - but not noisy enough to scare people off. Or, I'm fugly :-)