“Five exclamation marks, the sure sign of an insane mind.”

“Multiple exclamation marks,' he went on, shaking his head, 'are a sure sign of a diseased mind.”

“And all those exclamation marks, you notice? Five? A sure sign of someone who wears his underpants on his head.”

“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.”

“Somewhere deep inside his mind, somewhere beyond the event horizon of rationality, the sheer pressure of insanity had hammered his madness into something harder than diamond.”

“Insanity is catching.”

“It was octarine, the colour of magic. It was alive and glowing and vibrant and it was the undisputed pigment of the imagination, because wherever it appeared it was a sign that mere matter was a servant of the powers of the magical mind. It was enchantment itself.But Rincewind always thought it looked a sort of greenish-purple.”