Theres actually a I gave violance a 10 for this...
*WARNING*DO NOT REPEAT! me and a bunch of my friends made the 8 pointed star and were using them as chinese throwing stars, they worked a little to well when we threw them at one of my friends back, BUT THE ONLY REASON FOR THAT WAS BECAUSE WE THREW THEM EXTREMLY HARD AND WERE USING A EXTREAMLY HARD KIND OF PAPER! but as long as you don't do anything stupid with your origami, this is a fun tutorial...no lawsuits are intented