Check out this video on how to build a homemade rubber band crossbow. Yes, a rubber band crossbow. What, did you think you were going to go hunting with this thing? Only if your hunting wasps.
In this tutorial, you'll see how to make your own crossbow using electrical tape, bamboo skewers for the bolts, wooden dowel rods, Elmer's Wood Glue, a knife, a Leatherman, a Bic pen, and of course... rubber bands.