Yellow Jacket stun gun smartphone case
The world is a dangerous place -- and Yellow Jacket will make sure you're prepared. This stunning (sorry!) black, pink, white, yellow or red iPhone case doubles as a stun gun.
The hard plastic case emits a painful sting (its amperage output is 0.8 mA); it's not lethal but, if applied for long enough, could cause an assailant to collapse.
This case (which also contains a battery for charging your phone) is currently available only for the iPhone 4/4S; models for the iPhone 5/5S and the Samsung Galaxy S4 are coming. And before you buy, check local state and city laws to make sure that owning a stun gun is legal where you are. Purchase with extreme caution!