"Of course, Ankh-Morpork's citizens had always claimed that the river water was incredibly pure. Any water that had passed through so many kidneys, they reasoned, had to be very pure indeed."

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There's a saying that all roads lead to Ankh-Morpork. And it's wrong. All roads lead away from Ankh-Morpork, but sometimes people just walk along them the wrong way.

— Terry Pratchett