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Either the SAS survival handbook because it’d be one of the most useful books to have completely memorized, or maybe the Bible just to dunk on fundamentalists by quoting obscure passages that contradict each other.
Neither sounds super fun, but those are the first that come to mind.
On windows at least, that sort of already exists. You can hold down Alt and use 3 numpad numbers to “compose” any ASCII character you like. It’s fun!