What are you reading?

Bleu Raeder said
The only books I've read over and over again are the Hitchhiker's Guide series.

Similarly, a book must be both fun and complex for me to re-read (so that you enjoy learning new things the second time) which is pretty much just LOTR and ASOIAF.

Or very uniquely funny - like Hitchhiker, Flashman, and Confederacy of Dunces.