My high school buddy and I were building a shed. He was a framer and had all the tools and a big framing axe/ hammer. Well he prided himself in tap then sink. Two wacks and a 16 penny nail sunk all the way in. He tapped then went for the sink and caught the edge of the 16 penny nail. I flew straight up and thru his eye. I just about soiled myself. I think he was calmer than I was. The paramedics showed up and bandanged the whole thing up with the end of the nail sticking up and he got to ride a ambulance to the hospital. He is now blind in that eye. Makes me shiver to even think about it 20 some years later.