One Piece Chapter 1.2, page 32: Romance Dawn (Version 2)

Luffy lands back on the deck. Anne, sweating in shock, asks, 'W-WHAT ARE YOU...!?' Luffy grins and stretches his cheeks wide: 'ISN'T IT FUNNY? I TOLD YOU I ATE THE GOMU GOMU FRUIT, RIGHT? I'M A HEAD-TO-TOE RUBBER MAN. IN EXCHANGE FOR BEING A HAMMER FOREVER.' Anne and the remaining pirates scream in unison, 'R-RUBBER MAN!!?'