Ach, people are always telling us not to do things" said Rob Anybody, "that's how we ken the most interesting things to do.

Raise the stakes! Always push your luck because no one else would push it for you.

That's the Ankh-Morpork instinct, Vimes thought. Run away, and then stop and see if anything interesting is going to happen to other people.

Last night there seemed to be a chance. Anything was possible last night. That was the trouble with last nights. They were always followed by this mornings.

Nanny Ogg looked under her bed in case there was a man there. Well, you never knew your luck.

Ridcully was to management what King Herod was to the Bethlehem Playgroup Association.

Everyone's heard of Erwin Schrodinger's famous thought experiment. You put a cat in a box with a bottle of poison, which many people would suggest is about as far as you need to go.