One Piece Chapter 6, page 12: Chapter 6: Number One

Seeing the Marines turn their guns on themselves, Zoro runs forward, shouting, "SOMETHING'S WRONG WITH THOSE NAVAL MARINES!!!" Meanwhile, Luffy charges directly at Captain Morgan, yelling, "HEY! I'M YOUR ENEMY... TRY PUTTING ME TO DEATH!!!" With a swift and powerful movement, Luffy punches Morgan squarely in the face, sending a shockwave through the tyrant with a loud "WUH!!" sound effect.