Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH,' the paint wouldn't even have time to dry.

The rising sun managed to peek around the vast column of smoke that forever rose from Ankh-Morpork, City of Cities, illustrating almost up to the edge of space that smoke means progress or, at least, people setting fire to things.

What kind of man would put a known criminal in charge of a major branch of government? Apart from, say, the average voter.

The universe contains any amount of horrible ways to be woken up, such as the noise of the mob breaking down the front door, the scream of fire engines, or the realization that today is the Monday which on Friday night was a comfortably long way off. A dog's wet nose is not strictly speaking the worst of the bunch, but it has it's own peculiar dreadfulness which connoisseurs of the ghastly and dog owners everywhere have come to know and dread. It's like having a small piece of defrosting liver pressed lovingly against you.

He helped the Librarian up. There was a red glow in the ape's eyes. It had tried to steal his books. This was probably the best proof any wizard could require that the trolleys were brainless.

...it is well known that a vital ingredient of success is not knowing that what you're attempting can't be done.

And our lady friend, she thinks life works like a fairy tale.' Well, that’s harmless, isn’t it?' Yeah, but in fairy tales, when someone dies... it’s just a word.