Wyrd sisters.

I originally read this when it first came out and it has been one of favourite light reads ever since. Admittedly, the humour is not quite as laugh out loud hilarious as it was when I was younger, but it still manages to raise a smile. I am now tempted to go back to The Colour Of Magic and work my way through to the end (which, unfortunately, is very much the end now), however there are now something like 40 books in the series, so that may be a tall order.

Although the Discworld is probably going to appeal most to the teen market, I think there should be room for a little Pratchett in everybody's life.