How about people who think their purse/laptop/backpack/whatever deserves the extra seat more than a human does? I see this on the subway, the bus, the airport waiting areas, anywhere that there are seats. If you see that there are people standing, grow some manners, move your bag, and let someone else enjoy a seat. Note to Nasty Lady on the Sacramento Airport shuttle to the rental cars last Tuesday night: it's 1 am Eastern time, I've been in airports or airplanes for 9 hours now, and I can guarantee you that your purse is nowhere near as tired as I am. Move your bag or I am sitting on your lap. Ho.