You are very clever,' said the old man shyly. 'I would like to eat your brains, one day,' For some reason the books of etiquette that Daphne's grandmother had forced on her didn't quite deal with this. Of course, silly people would say to babies, 'You're so sweet I could gobble you all up!', but that sort of nonsense seemed less funny when it was said by a man in war paint who owned more than one skull. Daphne, cursed with good manners, settled for, 'It's very kind of you to say so.
Terry PratchettOnce you've ruled out the impossible then whatever is left, however improbable, must be the truth. The problem lay in working out what was impossible, of course. That was the trick, all right. There was also the curious incident of the orangutan in the night-time.
Terry PratchettProbably the last man who knew how it worked had been tortured to death years before. Or as soon as it was installed. Killing the creator was a traditional method of patent-protection.
Terry Pratchett