"You are the same today as you will be in five years except for two things: the people you meet and the books* you read." (Charles T. Jones)
*interpreted to include stage productions and movies especially those connected with books
I would pick Sherman Alexie's The Absolute True Story of a Part-Time Indian. Quite a stir was caused in the school I used to teach at when a teacher read passages aloud in class...
I've never read The Absolute True Story of a Part-Time Indian. As a librarian, I often was embroiled in censorship issues. Sometimes the books were worth fighting for; sometimes it was censorship we fought against (Madonna's book, for example).