During one summer doing construction for the family business, i managed to shoot a 16 penny nail (about 3 1/2 - 4 in long) with a nail gun @~100 psi entirely through my hand into a stud. I then had to take a hammer and pry it out; needless to say, wasnt too pretty. Bandaged it up and after a while, got back to work. Im not sure if it was a case of shock or what, but it didnt bother me as much as that shouldve.