Thanks to elspode and tux for submitting this.
Oh that's gotta hurt. Six nails embedded in the skull of construction worker Isidro Mejia, 39. Somehow he fell into his buddy who was operating a nail gun. Five of the six nails were removed in surgery right that day and the sixth was removed a little later after the swelling went down.
They actually did a police investigation on this and determined that it was an accident.