One Piece Chapter 18, page 10: Buggy, 'The Clown Pirate'

Buggy is impressed, laughing, 'OHO!! SO, YOU CAN DO THINGS LIKE THAT!! HOW INTERESTING!!' Luffy immediately counters, winding up his arm and shouting, 'GOMU GOMU... PISTOL!!' He fires a powerful stretched punch straight at Buggy. However, Buggy detaches his head with a 'PLOP...' sound effect, letting Luffy's fist pass harmlessly underneath. Buggy smiles and says, 'YOU'RE AN INTERESTING PERSON TOO. IT'S AN INTERESTING ABILITY, BUT...!!'