In 2000, after another close loss by a mediocre Boston Celtics team, coach Rick Pitino decided he’d had enough: enough of losing, of the fans, and of the city’s attitude. At the postgame news conference, he vented his feelings: Larry Bird is not walking through that door, fans. Kevin McHale is not walking through that door, and Robert Parish is not walking through that door. And if you expect them to walk through that door, they’re going to be grey and old.