I was just re-reading my tankoubon of the earlier op manga and noticed a starnge occurance…
When Luffy is asleep under the bow of Kuro's ship, Nami runs off to wake him up and Jango through one of his cirlce thingsy and hit luffy in the back of the head. It bleed a lot and seemed to have gone pretty deep, however Luffy did not die... Anyone have any idea why he didn't die from geting a big sharp metal circle stuck in his head?