Lord Vetinari, the Patrician of Ankh-Morpork, poked at the ink in his inkwell. There was ice in it.
"Don't you even have a proper fire?" said Hughnon Ridcully, High Priest of Blind Io and unofficial spokesman for the city's religious establishment. "I mean, I'm not one for stuffy rooms, but it's freezing in here!"
"Brisk, certainly," said Lord Vetinari. "It's odd, but the ice isn't as dark as the rest of the ink. What causes that, do you think?"
"Science, probably," said Hughnon vaguely.

Auteur: Terry Pratchett