Airzooka Air Gun

http://www.thinkgeek.com/geektoys/warfare/60b6/

Airzooka Air Gun

This Airzooka Air Gun in the ultimate fun gun! There is no need for batteries or electronics to get this gun to work, and it shoots balls of air up to twenty feet! The most overwhelming feature: you will never run out of ammunition, because it shoots AIR!

The price of $13 is well worth it to scare the crap out of your friends with flying balls of air.