I answer the phones at work. Apparently the most difficult question that I ask in any given day is, "Would you like to leave them a voice mail?"
Seriously - it's a yes or no question. Either they can get back to you or not. Either it's actually important, or it's not. All of these should be known before you pick up the phone to call someone! It shouldn't take extreme thought and concentration to make that decision.
ARG!
People are so irritating!
ARG!