Take a normal 45 lb olympic bar and stand it up on end, with your hand gripping the bar at a level that allows your elbow to bend at a 90 degree angle. Then hammercurl the barbell to shoulder height and press it overhead keeping your elbow in.
Nice forearm, bicep and tricep exercise. Can also be done with a lighter weight olympic length bar or E-Z Curl bar. That Olympic bar is Very hard to control. Just made this up.