The worst thing you can do is nothing.

Take it from me, whenever you see a bunch of buggers puttering around talking about truth and beauty and the best way of attacking Ethics, you can bet your sandals it's all because dozens of other poor buggers are doing all the real work around the place.

Your average witch is not, by nature, a social animal as far as other witches are concerned. There's a conflict of dominant personalities. There's a group of ringleaders without a ring. There's the basic unwritten rule of witchcraft, which is 'Don't do what you will, do what I say.' The natural size of a coven is one. Witches only get together when they can't avoid it.

The dwarfs can turn lead into gold... It reached the pointy ears of the dwarfs. -Can we? -Damned if I know. I can't. -Yeah, but if you could, you wouldn't say. I wouldn't say, if I could. -Can you? -No! -Ah-ha!

We're dealing here," said Vimes, "With a twisted mind." "Oh, no! You think so?" "Yes." "But... no... you can't be right. Because Nobby was with us all the time." "Not Nobby," said Vimes testily. "Whatever he might do to a dragon, I doubt if he'd make it explode. There's stranger people in this world than Corporal Nobbs, my lad." Carrot's expression slid into a rictus of intrigued horror. "Gosh," he said.

You have to start out learning to believe the little lies. "So we can believe the big ones?" Yes. Justice, mercy, duty. That sort of thing.

If you really want to upset a witch, do her a favor which she has no means of repaying. The unfulfilled obligation will nag at her like a hangnail.