These are a couple videos of Master S. Kamaraj of Vajram Warriors (a program that teaches Indian martial arts, blowgun, gymnastics, and basic self defense to youths) demonstrating his axe inspired boomerangs. The first video is of a traditional single headed axe, but the second is a double-headed axe. Obviously, the axe heads are wooden and just part of the boomerang design, because a real axe head would be so heavy it would never return. I mean not that you would ever want it to, unless you had a death wish or an exhilarating circus act.