Don't be a jerk.

I was waiting for the train this morning, reading a book, caffeine giddy, and when the train pulled in I did my customary sweep of the available seats and plotted towards the car that seemed to offer the most hope of me getting one. I shimmied down the platform alongside the door I wanted to use, and in doing so I nearly crashed head-on into a young woman who didn't do the shimmy thing, who was very passé and disinterested and waiting casually for the train to stop. She didn't have any of that blood thirst/seat lust in her eyes, and in fact, once she registered mine, she nearly laughed in my face. It was one of those "oh yeah, I hate myself now, too—thanks" moments. The train doors opened, and I let her take the good seat.