One Piece Chapter 38, page 21: PIRATE FLEET

Standing in the middle of the chaotic slaughter, Luffy is consumed by rage. He glares into the empty air and screams, "COME OUT, YOU EVIL BUTLER... WHAT THE HELL DO YOU THINK YOUR CREW MEMBERS ARE!??!" Nami looks at Luffy in shock and concern, whispering, "LUFFY...!!?"