bone razor
Legend has that a man was captured behind enemy lines during a black ops mission in a third world country. When the guards came to check on him he killed them with his bare hands. The guards were unarmed and he needed weapons so he made throwing knives out of their rib bones. He then escaped using these weapons. The enemies called him the Bone Razor.
My step-dad locked me in a closet so i pulled a bone razor on his ass