One Piece Chapter 1.1, page 33: Romance Dawn (Version 1)

Gyari picks up Luffy's straw hat, examining it: "OH, WHAT'S THIS? YOU SEEM TO BE UNSETTLED BECAUSE OF THIS HAT.". Luffy's expression instantly darkens, and he warns Gyari, "THAT'S NOT LIKE YOU...". Gyari sneers, "YOU REALLY MADE A MOCKERY OF THIS GREAT PIRATE, GYARI-SAMA.". Luffy struggles against his ropes, shouting, "AH!! GIVE THAT BACK...!!". Gyari deliberately lets the hat fall to the ground, saying, "OH, I DROPPED IT. IF IT'S IN SUCH A PLACE, I MIGHT ACCIDENTALLY... STEP ON IT? HA HA HA.". Luffy's eyes fill with intense rage, and he growls, "STEP ON IT AND I'LL KILL YOU.". Shiruku watches, remembering Luffy's words: "THIS HAT IS MY TREASURE, BUT IT DOESN'T BELONG TO ME. I WANT TO BECOME THAT KIND OF PIRATE AS WELL!"