Smart phone case with built-in stun gun

It's called the Yellow Jacket, and it offers protection for you as well as your phone:

Here at Yellow Jacket, we know from first-hand experience what is needed in a violent situation to escape danger. We have designed our iPhone 4 stun gun case to be easily deployable with one hand. In less than two seconds, both safety mechanisms can be deactivated and the Yellow Jacket stun gun is ready for action. Compare this to a regular stun gun which can take five to ten seconds to find and deploy.

Our iPhone stun gun case is capable of stopping an aggressive attacker. The 650K volt of electricity flows from the electrodes and into the assailant upon contact providing a potential victim with the opportunity to escape danger. Unlike other phone cases, the Yellow Jacket iPhone 4 case gives you the ability to defend yourself. Android models coming soon!