One Piece Chapter 1.1, page 39: Romance Dawn (Version 1)

Luffy launches himself from the tower like a giant slingshot, flying high speed through the air. Back on the beach, Shiruku and the headman watch in amazement, shouting, "HE FLEW!!!" and "GYARI!!!" and "WAIT FOR ME!!!!". As Luffy approaches the ship, he inhales deeply, inflating his body into a giant balloon to slow down: "HAPU" and "DECELERATION". He lands heavily on the ship's deck with a loud crash.