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In page Lord Vetinari:

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It has been suggested that Vetinari may not be entirely human, though this is primarily because of his methods and personality, as opposed to any sort of physical proof (although in The Fifth Elephant, Lady Margolotta was surprised at his lack of aging).[1] Vetinari admits to being "drunk as a skunk" after a banquet at Unseen University,[2] but continues to be startlingly lucid and eloquent, although Drumknott describes him as seeming "unusually talkative". The only discernible manifestation of his drunkenness: It takes him 15 seconds longer to solve the Ankh-Morpork Times' daily crossword (Unseen Academicals).