One Piece Chapter 36, page 21: HUNTED!!

As the dust clears, Luffy realizes Kuro has vanished again, muttering, "DAMN... DISAPPEARED AGAIN." Kuro stands a short distance away on the slope, completely unharmed. He looks back at Luffy and says, "NEVERMIND! THEY ALREADY GOT UP THE SLOPE...! BEFORE WE FIGHT, I WANT TO ASK YOU ONE QUESTION... YOU'RE A STRANGER HERE, WHY ARE YOU GETTING SO INVOLVED WITH THIS VILLAGE?!" The remaining Black Cat Pirates watch in awe, whispering, "TH... THAT KID. HE ACTUALLY DARES TO CHALLENGE CAPTAIN KURO...!!"