The Next Vertical - The Danger Zone

Most companies have big issues trying to get into alternate verticals. Take Starbucks trying to sell other items in their stores, Its just not working. However one company that can get away with it is Apple. Imagine Apple came out with a cool pair of sunglasses (Maybe partner with Rayban).  With polished glass and smooth finishes.  I wouldn't be surprised if every apple fan would pick one up.  It would especially work when technology catches up with us and we have heads up-displays in our eye wear. Apple would be years ahead...