A Confederacy of Dunces by John Kennedy Toole
If you're looking for summer reading material, you can't go wrong with this one. In my mind it is the funniest book ever written and the best literary depiction of the city of New Orleans and it's colorful characters and idiosyncrasies. A masterpiece. I keep it on my nightstand and read passages from it each night before going to bed. Just read the forward by Walker Percy and I dare you not to want to read more.
I laughed out loud so much while reading this book that the people around me thought I was insane. Ludicrous, irreverent, well-written, imaginative, descriptive and hilarious pretty much sums it up. The main character Ignatius J. Reilly is not your average fictional character, which is a blessing in itself. He is able to justify every one of his rude and selfish tendencies with flawed yet humorous logic. He regularly watches movies only to scream "What is this filmed abortion" at the screen and drops gems like "Canned food is a perversion." I love this book.