One Piece Chapter 22, page 8-9: YOU ARE A RARE AND PRECIOUS ANIMAL TOO

A loud gunshot rings out, and a bullet strikes Luffy directly in the chest. Nami screams in terror, but Luffy's rubber body simply stretches to absorb the impact before snapping back and sending the bullet flying harmlessly away. Nami is amazed to see that bullets do not hurt him. The hidden shooter gasps in shock, asking what kind of creature Luffy is, to which Luffy retorts that that is their line.

Nami spots a pistol lying on the ground and points out where the shot came from. Nearby sits a strange object that looks like a treasure chest with a massive, bushy afro growing out of it. As they watch, the chest suddenly sprouts human feet and begins running away, only to trip over a root and crash face-first. Luffy and Nami walk over to find a furious man stuck inside the chest, who demands they lift him up. Luffy laughs and calls him a "cauliflower man," while Nami points out that he tripped over his own feet.