One Piece Chapter 1.1, page 38: Romance Dawn (Version 1)

Standing on the edge of the tower, Luffy stretches his arms incredibly far across the sky toward the pirate ship. His hands fly through the air with a loud stretching sound. He grunts, "MUN!!". His hands successfully reach the ship and grab onto the main mast. Luffy grins widely, shouting, "SHOOT!!!!" as he prepares to launch himself.