The Giving Tree
Author: Shel Silverstein
Guaranteed to improve: Your ability not to be a dick (Even if you've read the book before, trust us, you need a reminder.).
While making this list, we asked a number of different people what books they thought made them a better person. Shel Silverstein's book came up over and over again. Sometimes in life the simple lessons are most important.
There are few lessons more fundamental than the one Silverstein presents here: If you take advantage of someone's generosity, eventually they may have nothing left to give. While we are moved by the tree's sacrifice, the book remains a reminder that we want to avoid being the boy of the story, as well as the tree. For the masses of you who have already read that book and somehow haven't seen this, you're welcome.