You can basically transform anything made out of metal into a working knife—if you blast it with enough heat, pound it enough times with a hammer, and then sharpen it over and over again. Even an old horseshoe can become an implement of danger. Watch as Miller Knives uses the U-shape of the shoe to cook up a pretty looking blade with a bad ass curved handle. That bend is sweet.
Source: Gizmodo – Transforming a Horseshoe Into a Super Sharp Knife Is Pretty Clever