Do Not Disturb

This sign should save him a lot of time! In addition to the actual time spent dealing with people who interrupt you, there's the time you spend reorienting yourself once you are free of them, and the time re-doing whatever it was you were doing when the interruption occurred. My kids were on spring break last week, so I know of which I speak. No sign whatsoever would have helped me. -via Geeks Are Sexy