This is a Super-easy, three-shot, semi-automatic rubber-band gun that you can make in less than a minute.
(Sorry, I used my left hand; I'm right handed though, but I hurt my right hand so I had to demonstrate with my left)
Step 1: Items Needed
1: Three rubber bands
2: Your hand
Step 2: How to Load
Close your hand into a fist and then extend your thumb and index finger. Then hook a rubber band around the tip of your middle finger, pull it over your thumb, and place it on the tip of your index finger. Then do the same procedure for your ring finger and, lastly, the pinkie. Done -- you are ready to fire.
Step 3: Firing
To shoot the first one, lift your pinkie to release the rubber band, then your ring finger, and then your middle finger.