Stainless Steel Rat series by Harry Harrison. Phule's Company and M. Y. T. H series by Robert Aspirin. The Kingkiller Chronicle series by Patrick Rothfuss (desperately awaiting Book 3), Xanth series by Piers Anthony.
This is an eclectic list!Probably The Lord of the Rings by JRR Tolkien.
But I also really like:
Beggars in Spain by Nancy Kress
Cloud Atlas by David Mitchell
Dune by Frank Herbert
Enders Game by Orson Scott Card
Good Omens by Neil Gaiman
Harry Potter and the Deathly Hollows by J.K. Rowling (don't judge me, I was eleven when the first book came out)
Justice as Fairness: A Restatement by John Rawls
Letters to a Young Poet by Rainer Maria Rilke
On Liberty by John Stuart Mill
Pensees by Blaise Pascal
The Conquest of Happiness by Bertrand Russell
The Ego Trick by Julian Baggini
The Epistle of James
The Federalist Papers by Alexander Hamilton, James Madison, & John Jay
The Hitchhiker's Guide to the Galaxy by Douglas Adams
The Martian by Andy Weir
The Metaphysics of Morals by Immanuel Kant
The Sword of Destiny by Andrezej Sapkowski
To Kill a Mockingbird by Harper Lee
X-Wing: The Bacta War by Michael Stackpole
I remember when I read this -- if my memory doesn't fail me, it was recommended to me -- and being extremely surprised towards the end.Enders Game by Orson Scott Card
I remember my best friend and I had pre-ordered copies as soon as the option had become available, and we had sort of a bet going on about whether Harry would turn out to be a Horcrux. She said yes, and I said no because he'd need to die if he was one.Harry Potter and the Deathly Hollows by J.K. Rowling (don't judge me, I was eleven when the first book came out)