If you have someone you dislike in class, chances are that you’ve sent a rubber band flying from your finger tip to his (or her) face before. Of course, firing one rubber band at a time might not be the most efficient thing to do, and that’s probably why the Rubber Band Gatling Gun was invented. It’s capable of firing off 100 rubber bands as fast as you can turn the crank. It even offers barrels of different lengths, allowing you to load more powerful rubber bands. The only snag in your plans for revenge might be its $500 asking price, which is more than most people would be willing to pay just for a rubber band gun, albeit a very cool gun. Still, if you’re flush and hell bent on revenge, this might be something for you.