5. Batarang
In Batman: The Batarang has got to be Batmans most used gadget. If hes not flinging one into the face of a marauding super-villain (which he doesa lot), hes using one to trip a distant junction box or even in the Arkham games to carry an electrical charge to a dead power source.
In Reality: Its little more than a piece of sharpened metal, night on identical to the Japanese throwing star, or shuriken. Essentially, all youd need to do to own Batmans primo gadget is cut a piece of high grade metal into the appropriate shape, before grinding it down to razor sharpness - like this guy has:
Although this is highly inadvisable for many, many different safety reasons. Alternatively, you could just get hold of
a replica it wouldnt be as deadly, but itd certainly hurt enough if it hit you in the face.