Guards! Guards! (Discworld, #8)

by Terry Pratchett

Luckier rain fell on upland sheep, or whispered gently over forests, or pattered somewhat incestuously into the sea. Rain that fell on Ankh-Morpork, though, was rain that was in trouble. They did terrible things to water, in Ankh-Morpork. Being drunk was only the start of its problems.

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