I forgot to mention that, as I was walking into the office building early today, an elderly man was following me. Not getting a good look at him, I was convinced he was perfectly capable to open the door himself. Being the polite citizen, I thought about it a few seconds, and decided to enter without providing the courtesy "hold the door open" favor. When I got to the elevators, the old man came around the corner, and to my surprise, he was missing an arm. His other hand was carrying assorted books, so he could possibly have needed "a hand" in opening the door. So much for courtesy.