 After saying farewell to Coby, Luffy and Zoro are sailing out in the middle of the sea. A stroke of wind blew his hat from his head, which prompt him to remember a promise he made with a pirate he knew long ago. That man was Captain Shanks, who was a hero to Luffy, and gave Luffy his hat to take care of until they meet again. As a kid, he always wanted to join Shank s crew, but he tells him that a pirate s life is not for a kid like Luffy. This was also Luffy s encounter with the Devil s Fruit which made him obtain his ability to be made entirely of rubber. And the real reason on why his main goal in life is to become the Pirate King.