I saw the above sign pasted on the sliding door of a van while I was on my way to work. It reminded me of hiring a van to go on a trip sometime back. It also had an automatic door and the driver was always screaming at us for slamming the door (I think its bad for the door closing mechanism) but we kept on doing it .
The fundamental principle that the designers of this door violated is that when people get used to something it's very difficult to change. I think that goes double for software UI's, people are used to the existing familiar concepts and that's something we have to keep in mind before we design our next snazzy application.
