Harry Potter and the Deathly Hallows by You Know Who
Okay, this is not the real cover, but we all know what the book looks like so I thought I'd have a little fun. I loved the book, but I'm voting Maybe on inclusion.
On one hand, the book would make no sense to people who haven't read the series (Rowling doesn't even try, as she did with some of the earlier books).
On the other hand, it was the big book of the summer, and every teen was talking about it, even those who hadn't read it. Eclipse by Meyer was a close second, but this book was king. I look forward to everyone's thoughts..