When has a book made you cry?

Has there ever been a book out there that has made you cry? Which book was it? What was it about that book specifically that brought on the tears?

The only thing that I remember crying over was during the Harry Potter series, most notably the latter part of the series when things started getting darker. There were certain deaths that really hit you hard during that series. I understand that there was a “war” going on from about the end of the 4th book till the end of the series and that death is an unfortunate part of that. There were just some deaths that were so unexpected or sudden that you really felt it. I think that is one thing that can make an author a really good one…..when they’ve gotten you so attached to a character that you feel that loss when that particular characters passes away.