Win the World Series a whole bunch of times. One championship will get you some coverage, but three will make you an icon.
Have a temper that results in epic tantrums when a call doesn't go your team's way. Kicking dirt, throwing your hat, and getting in an umpire's face is instant Twitter fodder. It may not be right, but it will get your name out there.
Never win a game. You won't have job for long, but no one will forget the guy who went 0-162.
Manage the Yankees, Red Sox, Mets, or Dodgers. These teams have mystique and national appeal. You might even get on Late Night with Jimmy Fallon.