We haven't done this one for a while, so I thought it might be nice to bring it back from the grave, so to speak...
Think of a famous book, play or film and sum it up in one sentence. Try as much as possible both to describe the thing that you're summarising but also make a comment upon it.
Here's a few to get you started:
I'm reading 'Albert Speer: His Battle With Truth' by Gitta Sereny at the moment. This could be best summed up with the sentence "Six Million Jews? I just thought he was a nice man with a lovely 'tache."