Actors, said Granny, witheringly. As if the world weren't full of enough history without inventing more.

Don't do anything I wouldn't do, if you ever find anything I wouldn't do.

The theater troubled her. It had a magic of its own, one that didn’t belong to her, one that wasn’t in her control. It changed the world, and said things were otherwise than they were. And it was worse than that. It was magic that didn’t belong to magical people. It was commanded by ordinary people, who didn’t know the rules. They altered the world because it sounded better.

Magic is just a way of saying 'I don't know.'

It was the heart of any scam or fiddle -- keep the punter uncertain, or, if he is certain, make him certain of the wrong thing.

You’d better tell me what you know, toad,” said Tiffany. “Miss Tick isn’t here. I am.” “Another world is colliding with this one,” said the toad. “There. Happy now? That’s what Miss Tick thinks. But it’s happening faster than she expected. All the monsters are coming back.” “Why?” “There’s no one to stop them.” There was silence for a moment. “There’s me,” said Tiffany.

A police procedural novel can be even funnier if the police include Trolls and Dwarves and things like that. You start looking at the whole basis of the cop novel. You get the cop moving in a different way when you've actually set it in a fantasy city.