Running with Scissors. Without a doubt the most disturbing book I have ever read. If it wasn't for a book club I would not have finished it.
Grapes of Wrath
I couldn't make it through Atlas Shrugged. By the time I got to the ridiculousy long, repetitive speech at the end it had become such drivel that it wasn't worth finshing.
Obsidian. It was written a few years after Twilight and just like Twilight except not as interesting and instead of vampires there were aliens.
The Twilight series.