One Piece Chapter 18, page 16: Buggy, 'The Clown Pirate'

Luffy is knocked backward into the rubble. He sits up, blood dripping from his forehead, and looks down at his straw hat. He sees three clean knife slashes cut straight through the crown of the hat. Luffy's expression turns to one of absolute fury as he growls, 'YOU BASTARD!! THIS HAT!!!' Buggy, reassembling his hand, laughs mockingly, 'WHAT? SO, YOU'RE PISSED THAT YOUR FACE IS SCARRED?' Luffy ignores him, trembling with rage as he mutters, 'HOW DARE YOU MESS UP...'