Most Difficult Books

Flavorwire, the worst kind of electrician snack ever, has a list of the fifty toughest books ever to read.   Dante's Inferno is one I've actually read, completed, and I don't think it's all that hard, if you acclimate yourself to the time and theme of the book; Naked Lunch, on the other hand, I attempted in my twenties and didn't get more than a dozen pages into it.  There wasn't even anything to appreciate about the book; I had to stop.   Much of the list, thought, are books I've considered reading, which means if I can successfully read a book labeled "tough" by a flavored wire, I'll be doing pretty good.