Miracle Jumper Cable

I'm paying the bills.  The wastebasket is filling up with all the junk advertising that gets packed into bills.  I'm pitching it as fast as I open 'em.  Til I get to this one that I just gotta share.
"Safely Start you car's dead battery without opening the hood".  And they show a special cable that plugs into the cigarette lighter socket.  Excuse me, the "DC Power Port".  This I gotta see.  It takes 500-800 amps to crank a big motor in cold weather. The cigarette lighter circuit has a 20 amp fuse in it.  Plug it in, hit the starter and pop, the cigarette lighter stops working.  
  Only $14.95 plus $5.95  Shipping and handling. 
  Such a deal.