Take a large marble and smash it so that it breaks in half. Lay a piece of nail from your enemy on the flat part of this hemisphere, and cover it with another hemisphere made from molded pine resin and assafoetida. If you're in an especially bad mood, toss this out of the car window on the interstate. Your
victim won't be able to accomplish any of his/her plans, and get terribly frustrated as he/she struggles against the apparent sphere of impotence surrounding him/her.