One Piece Chapter 18, page 17: Buggy, 'The Clown Pirate'

Luffy screams at the top of his lungs, 'I WILL NEVER FORGIVE ANYONE WHO MESSES UP THIS HAT!!!' Buggy is taken aback, asking, 'WHAT?' Luffy holds the hat tightly, declaring, 'THIS IS MY TREASURE!! I GOT THIS HAT AGES AGO FROM A FRIEND.' Nami watches Luffy's outburst in surprise, thinking, 'I THOUGHT THIS GUY WAS SOMEONE WHO'D NEVER GET AGITATED AT ANYTHING, BUT HE'S SO PISSED OFF NOW...!!' Buggy looks at the hat and asks, '....... IS THE HAT THAT PRECIOUS TO YOU? YEAH, YOU BASTARD!' He then swiftly prepares another attack.