By the power of truth, I, while living, have conquered the universe.
The Great Gatsby (Northanger Abbey is a close second).
It was bloody horrid! I've loved everything else from Homer's Odyssey to The Bloody Chamber, Crime & Prunishment and Of Mice & Men. Some of my favourite books have come from reading at school, but Gatsby was horrid. Still got 100% on my AS exam on it though.