How does the book end? Where have you seen the last sentence before?

So Ponyboy calls Mr. Syme, his English teacher, and asks if his theme can be longer than five pages. When he gets permission, he begins to think about how to start the story, and decides to begin with "When I stepped out into the bright sunlight from the darkness of the movie house, I had only two things on my mind: Paul Newman and a ride home..." which is the opening of The Outsiders itself.