The Knucklecase for the Apple iPhone 4 and iPhone 4S cushions your smartphone from life's hard knocks while helping callers get a grip on any situation. Sure it's as subtle as a punch in the nose but if you don't like it... tough!
The design draws on that traditional force-multiplier employed by thugs and street toughs: brass knuckles. Simply add a rectangular space sized for your Apple iPhone 4 or 4S, pop in your shiny new phone, and hold on to your hat – the solid, secure grip provided by the Knucklecase gives users the confidence to multitask at their leisure.
One might, say, conduct a conversation with your Knucklecase-equipped iPhone on the one hand while conducting a brass knuckles enhanced interrogation with the other... unlikely perhaps but no longer impossible!
The Knucklecase is made in China from tough ABS plastic given a coat of metallic paint. Not as durable as actual brass knuckles but who punches somebody while gripping their iPhone in their fist? Nobody, that's who.
A couple of online stores (Vania and BmB) are featuring the Knucklecase on Rakuten priced at 1,980 yen or about $25 each, tax included. Makes a great gift and a great travel case though you may want to check with your friendly neighborhood TSA agent to make sure it's allowed on passenger planes.
(UPDATE: These are now available in the U.S., and you can buy various colors like silver, brass, gold and copper here for less than $10.)