Sometimes I think that many of the "Here's Your Sign" moments are just conversation starters - when people will state the obvious or just to have something to say. I have that happen a lot at work because my desk sits on the "expressway" in the company. People will just say something just because they're passing my desk and maybe feel awkward not making some sort of acknowledgment. Sometimes its OK - but other times I have to stop what I'm doing to make a remark - no matter how mundane it is. The best ones are concerning my co-worker who sits in the same room. When she is gone, even if its up on the in/out board, someone always asks "Where's ______? If I'm feeling tired - I'll just point to the board - but then they'll ask all sorts of questions... "Is she sick?" "What's she doing?" (if she's on vacation). To stop most of that, I try to send out a email the night before explaining all this to stop the interruptions.