I have a customer whose computer I regularly maintain, he is somewhat of a computer dolt, but thinks he is a whiz. On fixing one of his self created problems once, I got into one of his exel files and set it up so that when he selected a certian cells, a msg box would pop up and say something like, "Bill, we at microsoft have spent billions to perfect this software and make it as user friendly as possible, have you ever considered takeing a course or two on how to use it", or, "Bill, it is time that some one told you that you maybe should take this computer back to where you purchased it and try and get your money back, because you just arn't smart enought to use a computer". I have several cell set up within his main spread sheet that should keep him guessing as to what is going on for a long long time.