I can never get enough of Pratchett's way with words, especially his descriptions:
He looked the kind of person who, when they blink, you mark it off on the calendar.
This was a really fun novel, with some great characters: Rincewind, of course, but also Conina and Nijel, a repeat appearance by Death, and some very inept Horsepersons of the Apocalypse (or Apocralypse, as they call it). Oh, and the Luggage.
I know the next Discworld club read has started, but I'm going to save Wyrd Sisters for the Halloween Bingo, since it works perfectly for one of my squares.