One Piece Chapter 34, page 18: Clahador the Butler

Before Kuro can attack Usopp, Luffy's fist flies in and punches Kuro squarely in the face with the sound effect "PUNCH!!", sending him crashing to the ground. Jango is shocked, gasping, "WHA... WHAT?!!". The other pirates are stunned, crying, "CAPTAIN KURO GOD KNOCKED DOWN?!" with the sound effect "DODOOOO". Luffy cracks his knuckles with the sound effect "DON!" and says, "IF YOU REALLY HATE BEING HIT... I MUST MAKE SURE I HIT YOU A FEW HUNDRED MORE TIMES!!".