Aliens don't get stuck in air ducts. It's practically a well-known fact.

Don't stick your nose where someone can pull it off and eat it.

The wages of sin is death but so is the salary of virtue, and at least the evil get to go home early on Fridays.

Some of them wanted to sell me snake oil and I'm not necessarily going to dismiss all of these, as I have never found a rusty snake.

There's some things that you wouldn't tackle in a children's book because it would be beyond, not the mental capabilities, but the experience of someone under the age of say ten or eleven to encompass. But that field is smaller than you might think. They can easily cope with death and things like that; they know about it and it's a subject that often preoccupies them.

The IQ of a mob is the IQ of its dumbest member divided by the number of mobsters.

Picturesque meant - he decided after careful observation of the scenerey that inspired Twoflower to use the word - that the landscape was horribly precipitous. Quaint, when used to describe the occasional village through which they passed, meant fever-ridden and tumbledown. Twoflower was a tourist, the first ever seen on the discworld. Tourist, Rincewind had decided, mean 'idiot'.