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The aptly-named knucklecase is a way to take your precious gadget and transform it into a weapon.
Apart from clasping your phone by slotting your fingers through the solid aluminium case and swinging it about when you're bored, there's little else this case achieves except for show -- and of course, the Knucklecase for the iPhone 4/4S isn't meant to be used as a weapon.
The firm's disclaimer says the Knucklecase is only to be used "as a handle and protective accessory," and so "any other use of the product is considered a misuse," -- and you take responsibility.
Considering its value, the iPhone isn't exactly first choice in weapons -- unless you're certain celebrity figures we know.
If you like it, pick the case up for $79.