The Yellow Jacket is the thing you probably didn't know you needed (and maybe still don't need but would like to see a video of): a combination iPhone case and stun gun. Put in your iPhone 4 or 4S--and, soon, iPhone 5--then power up the case and send some voltage to the bad person nearby. Also, less uniquely but still helpfully, the case acts as a battery charger, juicing up your phone while you defend yourself from a mugging or whatever. It even comes in a variety of colors so you can express yourself during said situation.
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