One Piece Chapter 18, page 10-12: 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...!!

Buggy points out the flaw in Luffy's attack, saying, 'AN ARM THAT'S STRETCHED TO ITS LIMIT...! IS FULL OF WEAKNESSES! I'LL TEAR IT TO SHREDS...!!' Buggy's detached hand flies over and firmly grabs Luffy's extended arm with a 'GRAB' sound effect. Luffy gasps, 'HUH!!?' as Buggy prepares to slash his arm. Luffy quickly reacts, swinging his body to launch a counterattack, shouting, 'GOMU GOMU...

Luffy swings his leg to strike Buggy, shouting, 'SCYTHE!!' However, Buggy anticipates the move and shouts, 'BARA BARA EMERGENCY ESCAPE!!' He splits his torso and legs apart with a 'POP!!' sound effect, allowing Luffy's leg to swing harmlessly through the empty space between his separated body parts.