The winner is the "office bow of death," and I am very sorry I'm unable to get the video to play. Starting with just 4 wooden rulers, a box of PaperMate pens, a bag of 84 size rubber bands, strapping tape, and a small length of Cat5 cable, you end with a potentially lethal weapon, as the creator notes:
Note**: This information is provided as "Educational Knowledge".Don't try this at home, kids. Gives whole new meaning to nsf. (And they taunt me because I spend my spare time blogging.)
This weapon can actually penetrate flesh, muscle and eyeballs.
I am not responsible for the mis-use of this knowledge.