An amazing Japanese man makes a razor-sharp knife out of underwear without using power tools. You read that right. We know you want to make some rude joke about hard things and underwear, but don't do that. You're better than that and we appreciate the fact that you thought that first. What we really want you to do is think about the time and effort his man put into making a knife. Then giggle at the fact that he made a video of him making a knife out of underwear!! That knife looks pretty dang sharp too!