Insanity is catching.

“...for the first time Rincewind saw the troll.It wasn’t half so bad as he had i…”

“Rincewind tried to force the memory out of his mind, but it was rather enjoying…”

“NAUGHTY AND NICE? said Death. BUT IT'S EASY TO BE NICE IF YOU'RE RICH. IS THIS …”

“Anyway, it's like with bikes,' said the first speaker authoritatively. 'I thoug…”