One Piece Chapter 7, page 11-13: Chapter 7: Friends

Koby panics, screaming, "LUFFY!! DON'T!!" in his mind. Luffy continues talking to Ripper, "SHE WAS REALLY MEAN... AND FOR TWO YEARS, THIS GUY..." Koby snaps and punches Luffy right in the face with a massive "WHACK" sound effect, screaming, "SHUT UP!!!" Luffy is sent flying back.

Luffy rubs his cheek, smiling slightly, while Ripper, the Marines, Rika, and Ririka look on in shock. Zoro smiles, realizing what Luffy is doing. Koby stands panting, "HUF HUF", sweating and terrified of what he just did. Luffy suddenly gets up, angry, and yells, "WHY, YOU--!!" as he punches Koby hard in the face with a loud "WHAM!!" sound effect.

Luffy continues to beat up Koby with rapid punches, making "FWAK THWAK THWAK BAM" sounds, shouting, "TAKE THAT! AND THIS!!" Ripper is shocked, and then angrily yells, "ENOUGH! STOP DISTURBING THE PEACE!!" Zoro grabs Luffy by the collar with a "RSSK" sound, saying, "HEY, HEY... THAT'S ENOUGH." Koby lies bruised and battered on the floor. Ripper points at Luffy and Zoro, shouting, "IT'S CLEAR THAT YOU'RE NOT FRIENDS!!! PLEASE, LEAVE TOWN! NOW!!!