The Yellow Jacket is the vision of violent crime victim Seth Froom. After being robbed, Froom set out to do something about it and launched the project.
The stun gun case that protects you and your iPhone can be armed to defend with a 650,000 volt blast in less than two seconds. Also, if you find your iPhone's battery in danger of expiring, the external battery can provide additional 20 hours of standby.
The Yellow Jacket is over halfway, but still short of its fundraising goal at Indiegogo. The case is expected to retail for $125, but it can be pre-ordered at $100.
I think Froom may be short-sighted on his creation though. Think of the gaming potential! It could take haptic feedback to the next step.