For example there is The Book Thief!
I don't believe The Book Thief was originally written for children. It is very complex, and the narration style (death narrates) is not only dark, but confusing at first. But the main character is a little girl, so it was published for children. I wonder if one of my favorite books, Lullabies for Little Criminals, would have done better if it was categorized as Y.A. instead of Adult Fiction. Like The Book Thief the main character is a little girl, and like The Book Thief it is not a happy book. But its writing style is actually less complex, though its emotions are completely raw. It has very adult themes of drugs and sex, but these themes are all over the Y.A. world! If you want a good wholesome book for your child, don't go into the Y.A. section! Ellen Hopkin's Crank & Burned have been some of our local Y.A. bestsellers. Lullabies for Little Criminals would fit right in! The thing is, although it is on our adult staff pick wall, with a tag in front of it discussing what a great book it is, we have only sold about five copies of Lullabies for Little Criminals in the last year and half. Most staff picks sell at least 10 copies a year. I think Lullabies for Little Criminals would have done better if it had been marketed to the teens.
In her essay Ms. Rabb has some great quotes by Sherman Alexie, author of a number of popular adult books, and the hugely popular The Absolutely True Diary of a Part-Time Indian. Mr. Alexie says "I thought I’d been condescended to as an Indian — that was nothing compared to the condescension for writing Y.A." But he also admits “This book sold like crazy in a way my books never have before, and I’ve had a great career.” It is true, though his books are popular at Spellbinders, we don't usually sell more than three copies of any one of his adult titles in a year, but we have sold over 50 copies of his Y.A. novel - I've sold it to adults and kids.