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Except for the whole irreversible nervous system and brain damage, e.g., loss of motor control, numbness in limbs, blindness, and inability to speak part, mercury would probably work pretty well :)

I have heard great things about dynabeads and BB's in the Jeep/offroad community. BB's are cheaper (especially since you will be using pounds of them), but they could invite rust. I would think that many small objects (dynabeads etc.) would be better than a few large ones.