Your title is fairly misleading by the way.
What you need to do is put on your punk belt with metal studs, maybe a few studded bracelets, and just play the crap out of it. Bounce it off the wall, spin it on the floor, spill some stuff on it, clean it with bleach, spray it with lighter fluid then light it on fire, shoot it with a bb gun, practice darts on hit, use throwing knives, tow the body behind your car, all while not trying to damage the neck.
If you are trying to get a "vintage" or "reliced" look, you cant really do it with polyurethane finishes, so some sandpaper for the forearm contour may be in order.