Those who attended the Prep School Showcase at the Saint Andrew’s School over the weekend  . . . at least those of us who grew up on Long Island in the 60’s and 70’s who were (and still are) Jets fans . . . probably did a double take at one of the relatives among the crowd watching the proceedings:     Word got out of course, except that one huge fan just missed the opportunity to snag a pic . . . thanks to a slow to react photographer . . . Yes sports fans . . . that’s Joe Willie Namath.