Reread Book Tag

As general rule, I don't reread books. I have this mental shelf, every story has its own place, its own label and synopsys, and that's pretty much it. Maybe I'd grab an old one if I needed a direct quote, or if New Book X was part of a series and the last installment dropped, uh, 84 years ago or something. But! Rules, exceptions, etc. I saw this book tag and it got me thinking. What wouldn't I mind picking up again, given the chance?