My favourite set of Pratchett books are the city guard ones. Captain Carrot is hilarious. Nobbs and Colon as traffic police... ingenious as well as organising things so that Colon ends up where he has never wanted to be!! You always feel for Vimes. The Patrician is my favourite though. I never tire of this, feet of clay, guards guards, and men at arms. Bring on the next one! Like many here have said; when you're sitting on the bus laughing out loud you don't half get some funny looks!!!