One Piece Chapter 18, page 19-21: Buggy, 'The Clown Pirate'

With a brutal 'STAB' sound effect, Buggy's knives plunge directly through the center of Luffy's straw hat. Luffy's eyes widen in absolute shock and horror. A brief flashback panel shows Shanks placing the straw hat onto young Luffy's head, saying, 'THIS HAT... IS MY GIFT TO YOU.

Buggy steps on the stabbed straw hat, laughing hysterically, 'KUHAHAHAHAHAHAHA WHAT SORT OF TREASURE IS THIS RAG-LIKE-HAT?!' Luffy grinds his teeth in pure rage, his face shadowed. Flashback panels show Shanks smiling and saying, 'THIS IS MY FAVORITE HAT, YOU KNOW. WHEN YOU BECOME A GREAT PIRATE IN THE FUTURE, YOU'LL RETURN THAT HAT TO ME.' Back in the present, Luffy charges forward with a furious roar, 'THAT'S THE HAT I SWORE MYSELF TO WITH SHANKS!!!

Buggy is shocked to hear the name, stammering, 'WHAT? THIS IS SHANKS'S HAT?! I THOUGHT IT LOOKED FAMILIAR...!!' He spits on the hat and reveals, 'ME AND THAT GUY USED TO BE IN THE SAME PIRATE SHIP. TO REPHRASE THAT... HE WAS MY COMRADE WHEN WE WERE STILL PIRATE TRAINEES.' Luffy is stunned, asking, 'YOU SAY THAT HE WAS YOUR COMRADE!? SHANKS IS A GREAT MAN...' Luffy charges at Buggy, who quickly splits his head from his body, shouting, 'BARA BARA EMERGENCY ESCAPE!!