I love reading, and sometimes a book just really makes those waterworks start. Personally, there is only one book that made me start blubbering... and it wasn't even a story... It was called "Warriors: The Ultimate Guide"; a guide book made for the Warrior Cats series.
It had the stories of all of the characters in it. I was going fine until I read Crowfeather's backstory, and dude- that's sad.
What book has made you cry? Or close to tears?