>>the computer (horror of horrors) was wrong<<

All of which reminds me of a sign I once saw on the wall of a programmer's office. It was so apposite that I wrote it down and filed it:

"We have not succeeded in answering all of your problems. The answers we have found only serve to raise a whole set of new questions. In some ways we feel we are as confused as ever, but we believe we are confused on a higher level and about more important things."

You just gotta love it! :o)