You are almost certainly aware of this, but today is not just any Monday. In the same way that we all remember September 26, 2006 as the debut of Burger King's Chicken Fries, April 12th, 2010 will be seared upon our historical consciousness as the premiere of the new KFC sandwich, the Double Down. I'm afraid I must confess that when I-a connoisseur of speedily-prepared foodstuffs-first heard about this sandwich, I found the concept distasteful and thought myself unlikely to sample it. But here I am, having eaten both of the available versions and writing about them on the internet.