'Discworld' is taking something that you know is ridiculous and treating it as if it is serious, to see if something interesting happens when you do so.

Don't you understand?" snarled Rincewind. "We are going over the Edge, godsdammit!" "Can't we do anything about it?" "No!" "Then I can't see the sense in panicking," said Twoflower calmly.

People whose concept of ancient history is the first series of Star Trek may be treated with patience, because it's usually not their fault they were reduced to getting their education from school.

A Duke couldn't have the arse hanging out of his trousers when meeting foreign diplomats. Actually even plain old Sam Vimes never had the arse hanging out of his trousers, either, but no one would have actually started a war if he had.

I can see we're going to get along like a house on fire," said Miss Tick. "There may be no survivors.

Did I do anything last night that suggested I was sane?

A weapon you held and didn't know how to use belonged to your enemy.