I had to repost this look at DC bus riders from The 42. I have a long history of aggression directed at DC buses, and laughed out loud reading this one. Here are my favorites but you have to click over for the whole list!
The Traveler – You refuse to take a cab to the airport, despite having to utilize all 5 bags of your 5 bag luggage set. You can barely carry (drag) them all, but you know you can save some cash by taking public transit. Even though it will take an extra hour. You take up, at the very least, two seats.
Aisle Squatter – When the bus starts to fill, and you are standing, you should start moving to the back of the bus. It’s just nice. People can’t walk around you in the aisle, and the front of the bus is really crowded with standees. The back is literally a ghost town. Just remember that. And it looks bad from the outside.
DC Striving 
Love this! Especially since I ride the bus all the time and experience these. Grateful that I’m not on the list!
These are all applicable to the metro too. And I would add “The Pole Leaner”. You know those people who lean against the pole so you have nowhere to hold on to when the bus/metro moves. I am always shocked at how oblivious riders are to the rest of the riders (or, worse, inconsiderate of). I am too short to reach the ceiling handles so those poles are hot commodities and should not be entirely taken over by your back and ass.
ugh that is so annoying – I hate it!!! Good one though.