shark island is in wind waker in sector F3. You activate all these switches then fall down a hole. DO IT. Anyways, I found a way to get Link to bonk his head. Once you defeat puppet ganon, climb up the rope, and you should see all these chains going off the platform you're on. Do a jump attack while facing one to get up, then just keep walking until your head is hit. I found it by accident, but it's so fun! (not for link.) I might seem a bit frazzled. that is because Carlov won't accept my photo of the helmaroc king and that was my only chance!