Our personal favorite is this Yellow Jacket Stun Gun Case which acts as an iPhone case and as a defensive weapon as well. Base from the name, you probably already have an idea as to what its special factor is its stun gun. If you ever feel threatened, you can activate its stun gun and incapacitate your enemies. You don't have to be afraid of harming yourself, the case has a way for you to not accidentally stun yourself. It sells for $149.