Bed of Nails

Lay between two nail beds and have concrete block broken on your chest. It's very impressive and not as dangerous as it might seem. Shows inertia and force per unit area.

Pira DCS # 1K30.10

2 Wood Blocks with Nails   25lb Rubber Square   2 Wood block Seperators
Concrete Block   2 Books for Support   Carboard face Protection
Foam Leg Protection   Saftey Goggles   8lb Sledge Hammer