One Piece Chapter 1.2, page 26: Romance Dawn (Version 2)

Spiel sneers, 'LEARN YOUR PLACE!!!' Anne covers her eyes, weeping. However, the bullet does not pierce Luffy's head; instead, his rubbery face stretches backward like a slingshot. Luffy grins, 'HMPH!' With a loud snap, 'BYON BYON', his face springs back, launching the bullet right back at Spiel.