I originally posted this 4 years ago, but it's obviously time for a refresher.....
How to use an elevator:
When you arrive at the elevator, decide if you would like to go up or down and press the appropriate button ONCE. Frantically pressing the button every 1/2 second upsets the elevator god.
When the elevator arrives, stand back from the doors and give the people in the elevator a chance to get out. Barging into the elevator and pressing your floor number before people can get out will result in a thrashing.
When you get out of the elevator, keep going. I know that you think that you are very important and that the people behind you are either capable of walking through solid matter or, in fact, not even there, but some of us cannot walk through incredibly dense material. Be understanding.
When you see someone coming towards the elevator as the doors are about to close, OPEN the door. Do not pretend that you are pushing the open door button and shrug your shoulders.