The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair. Douglas Adams, "Mostly Harmless" More Quotes by Douglas Adams, "Mostly Harmless" More Quotes From Douglas Adams, "Mostly Harmless" A common mistake people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. Douglas Adams, "Mostly Harmless"