Life is a trick, and you get one chance to learn it.

And at the other end of the bar the world is full of the other type of person, who has a broken glass, or a glass that has been carelessly knocked over (usually by one of the people calling for a larger glass) or who had no glass at all, because he was at the back of the crowd and had failed to catch the barman's eye.

They'd smash up the world if they thought it would make a pretty noise.

Credulous: having views about the world, the universe and humanity's place in it that are shared only by very unsophisticated people and the most intelligent and advanced mathematicians and physicists.

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.

Quit while you're a head, that's what I say.

The important thing about having lots of things to remember is that you’ve got to go somewhere afterwards where you can remember them, you see? You’ve got to stop. You haven’t really been anywhere until you’ve got back home.