One Piece Chapter 38, page 12-13: PIRATE FLEET

Kuro continues his speech about the nature of a pirate crew: "IN A PIRATE FLEET, THE CREW MEMBERS ARE JUST 'PAWNS' FOR THE CAPTAIN TO USE AS HE WISHES. THAT MEANS, YOUR LIFE AND DEATH ARE ALL IN MY HANDS. EVEN IF THERE'S A WALL RIGHT AHEAD, YOU'D STILL HAVE TO FOLLOW MY ORDERS AND CHARGE AT IT!! AND SACRIFICE THEMSELVES FOR MY PLAN!! THAT'S THE WAY OF A PIRATE!!!! A WANDERING LITTLE BRAT LIKE YOU WOULD NEVER UNDERSTAND!!!" Luffy retorts, "EVENTHOUGH YOU'RE THE CAPTAIN OF A SHIP WHO CONTROLS HUNDREDS OF MEN... YOU STILL CAN'T DEFEAT USOPP!!

Kuro is insulted by Luffy's comparison, asking, "WHAT? YOU SAY THAT I AM INFERIOR TO THAT 'CAPTAIN' IN A KID'S PIRATE GAME?" Luffy replies, "THAT'S RIGHT." Kuro bursts into hysterical laughter: "HA HA HA HA... YOU'RE SO STUPID! DON'T GET COCKY JUST BECAUSE YOU'VE BROKEN MY 'CAT'S CLAWS'. IN WHAT WAY AM I INFERIOR TO HIM!?!" Kuro then begins to sway side to side, preparing a technique.