at least nine-tenths of all the original reality ever created lies outside the multiverse, and since the multiverse by definition includes absolutely everything that is anything, this puts a bit of a strain on things. Outside the boundaries of the universe lie the raw realities, the could-have-beens, the might-bes, the never-weres, the wild ideas, all being created and uncreated chaotically like elements in fermenting supernovas. Just occasionally where the walls of the worlds have worn a bit thin, they can leak in.
Terry PratchettThey were indeed what was known as 'old money', which meant that it had been made so long ago that the black deeds which had originally filled the coffers were now historically irrelevant. Funny, that: a brigand for a father was something you kept quiet about, but a slave-taking pirate for a great-great-great-grandfather was something to boast of over the port. Time turned the evil bastards into rogues, and rogue was a word with a twinkle in its eye and nothing to be ashamed of.
Terry PratchettA lot hinges on the fact that, in most circumstances, people are not allowed to hit you with a mallet. They put up all kinds of visible and invisible signs that say, 'Do not do this' in the hope that it'll work, but if it doesn't, then they shrug, because there is, really, no real mallet at all.
Terry Pratchett