Discworld - Terry Pratchett
Up and down the minaret
by Judin
Vimes and Vetinari get kidnapped by bandits (They're as surprised as you are). Now they're locked in a coffin-sized hole in the floor, bound hand and foot, and waiting for rescue. How shall they pass the time? Maybe Vetinari can show Vimes how to get a donkey down from a minaret.