Ah, Juanmaria. This explains why so many slow-learners are insomniacs!

Your anecdote reminds me of a time when my boss categorically stated that I was wrong because the inputted data could not be incorrect. It had gone through the computer, for Christ's sake! Later, he retracted his statement(short of an apology) after it was found that, after thorough rechecking, that the computer (horror of horrors) was wrong!! Or rather, it was incorrectly programmed (but not by me, I hasten to add!!!!),