This super cool USB powered 'Weapon of Mass (office productivity) Destruction' is actually a set of three air-darts. 

The swivel base rotates and launches the darts. 

The swivel and firing can be controlled via software (the USB darts come with the software CD). 

The darts can go upto 8 feet.

You can buy these $50.00 (plus shipping) from the FunUsb store.  As of this posting, they were 'out of stock'.

Watch the video below to see it in action!