My 11 year-old son saw a video on YouTube demonstrating how to make your own rubber band gun using household items. He HAD to try it! It is so cool that I told him we had to post it here.
Standard 12 inch ruler
3 rubber bands
1 short pencil (about 3 inches)
1 long pencil (sharpened with the lead broken off)
Step 1: Tape the short pencil to one end of the ruler (on the flat side of the ruler) as shown leaving about 1/4 inch of the sharpened end sticking out past the end of the ruler.
Step 2: Hold the long pencil perpendicular (pointed end up) to the ruler about 9 inches from the end you taped the short pencil to.
Step 3: Secure the long pencil to the ruler using two of the rubber bands by looping the rubber band over each end of the pencil. Twist and loop the rubber band around the pencil as many times as necessary to tighten it down. This will be your trigger and the tighter you make the rubber bands, the further it will shoot.
Step 4: Loop the last rubber band over the short pencil end and stretch it over the pointed end of the long pencil. The sharpened ends of the pencils will help your rubber band slip off a bit easier.