PVC Blow Gun

I bought some PVC for a projector screen and had some left over. After some thought about something productive I could use it for, I decided to turn it into a blow gun. It didn't cost me anything, but If you had to buy all the materials it would probably be between five and ten dollars. It works surprisingly well, and is fun to play around with, but if you shoot your eye out, don't come knocking on my door.

UPDATE: Go to step four for the updated one.

Step 1 Materials

Gun:

-PVC.
12 feet for 75 cents at home depot. They'll cut it for you.
-Hemp twine.

Darts:

I used this instructable to make the darts.