One Piece Chapter 4, page 6-7: Chapter 4: The Great Captain Morgan

Luffy asks Zoro where his swords are. Zoro explains that Captain Morgan's idiot son took them, noting, "Next to my life, those swords are my dearest treasures." Luffy gets an idea and offers to retrieve them from Helmeppo. However, he adds a condition: "Then, if you want your swords back... you'll have to join my crew!" Zoro angrily calls him a "little rat," but Luffy just laughs and runs off toward the Marine fortress, shouting, "See ya soon!" Zoro watches him go, muttering, "He's going into the fortress... That's one dumb pirate!

At the Marine base, soldiers are carefully raising a giant statue of Captain Morgan. Helmeppo complains loudly to his father, demanding to know why he isn't hunting down the "brigand" who hit him, boasting that even his father has never laid a hand on his face. Morgan asks if Helmeppo knows why he's never hit him. Before Helmeppo can finish saying "because I'm your beloved son," Morgan brutally punches him, declaring, "It's because you're an idiot son who's not even worth hitting!!