In no particular order: Don Quixote, War and Peace, The Karamazov Brothers, The Bible, Shakespeare, Proust, Ulysses, --- and these are just the most obvious world classics that I haven't got round to finishing yet.
It's not that I'm unwilling, it's just that I invariably give up after about 100 pages and then put the books back on the bookshelf. OK, the Bible and Shakespeare are in a different class altogether. I've read them a lot, but not from cover to cover - and anyway, they're not books you can just read once and then store them away. Then, there are plenty more classics by Goethe, Balzac or Dickens I've yet to start.
Should I feel guilty, should I feel inferior, or simply lazy?