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 or repair.
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Up until Twitter increased the character limit, it was impossible to fit that statement in a single Tweet. THAT'S the real reason. The relevant passage from "Mostly Harmless" (1992):pic.twitter.com/yF33nsoD7h
