“I notice you didn't laugh, Mr. Black!''No, Your Majesty. We are forbidden to laugh at the things kings say, sire, because otherwise we would be at it all day.”

“They didn't know why these things were funny. Sometimes you laugh because you've got no more room for crying. Sometimes you laugh because table manners on a beach are funny. And sometimes you laugh because you're alive, when you really shouldn't be.”

“We who think we are about to die will laugh at anything.”

“The fact was that, as droves of demon kings had noticed, there was a limit to what you could do to a soul with, e.g., red-hot tweezers, because even fairly evil and corrupt souls were bright enough to realize that since they didn't have the concomitant body and nerve endings attached to them there was no real reason, other than force of habit, why they should suffer excruciating agony. So they didn't. Demons went on doing it anyway, because numb and mindless stupidity is part of what being a demon is all about, but since no one was suffering they didn't enjoy it much either and the whole thing was pointless. Centuries and centuries of pointlessness.”

“There were a lot of things he could say. "Son of a bitch!" would have been a good one. Or he could say, "Welcome to civilization!" He could have said, "Laugh this one off!" He might have said, "Fetch!" But he didn’t, because if he had said any of those things then he’d have known that what he had just done was murder.”

“But we don't do things like that!" said Vimes. "You can't go around arresting the Thieves' Guild. I mean, we'd be at it all day!”

“What sort of person," said Salzella patiently, "sits down and writes a maniacal laugh? And all those exclamation marks, you notice? Five? A sure sign of someone who wears his underpants on his head. Opera can do that to a man.”