Dilbert walks through a door and thinks, "I hate this: somebody is just far enough behind me that it would be awkward to hold the door, but rude to let it swing." Dilbert walks away thinking, "I'll just pick up the pace and act like I don't notice anybody behind me." The door hits the person behind him. The person screams and falls down the stairs. Dilbert thinks, "Doors at the tops of stairs are the worst."