The kunai, which historically was used by the Japanese as a multi-purpose gardening tool, has also been used as a weapon. In particular, it is now seen as a throwing implement. For example, Jason Statham's character in the movie, "The Expendables" uses his kunai as a throwing knife.
http://youtu.be/gKfu6BYwa_g?t=1m1s
After this movie, I received many questions about the kunai. Thankfully, Patrick, owner of the knife throwing company, Flying Steel, sent me one.
https://flyingsteel.com/product/kunai
I fell in love with my kunai after I converted it into a rope dart. To see how I did that, check out this link:
http://youtu.be/UHf_HzUQwIg
This is also why you should stand far from the target and wear eye protection when throwing!
http://youtu.be/5QvFJvVtPaw
Also this is my spiel on Flying Steel and why they are so awesome!
http://www.youtube.com/watch?v=nKxFEuq5zg8
Zombie Nazi Mob Target
http://www.letargets.com/estylez_item.aspx?item=ZMOB-NAZIS