These weren't cheap modern books; these were books bound in leather, and not just leather, but leather from clever cows who had given their lives for literature after a happy existence in the very best pastures.

First Sight means you can see what really is there, and Second Thoughts mean thinking about what you are thinking. And in Tiffany's case, there were sometimes Third Thoughts and Fourth Thoughts although these...sometimes led her to walk into doors.

They may be called the Palace Guard, the City Guard, or the Patrol. Whatever the name, their purpose in any work of heroic fantasy is identical: it is, round about Chapter Three (or ten minutes into the film) to rush into the room, attack the hero one at a time, and be slaughtered. No one ever asks them if they want to. This book is dedicated to those fine men.

Most people who have found that they are more intelligent than most around them, have yet to learn that one of the most intelligent things they can do is prevent said people ever finding this out.

I think that sick people in Ankh-Morpork generally go to a vet. It's generally a better bet. There's more pressure on a vet to get it right. People say "it was god's will" when granny dies, but they get angry when they lose a cow.

"God does not play games with His loyal servants," said the Metatron, but in a worried tone of voice. "Whooo-eee," said Crowley. "Where have you been?"

There are no inconsistencies in the Discworld books; ocassionally, however, there are alternate pasts.