Years ago, while gazing out the window at the meadow surrounding their house, Paul and Linda McCartney watched lambs playing. They were having such a lovely time gamboling about in the sunshine. Paul and Linda then glanced at the sliced lamb on their plates. And that was it. It took only a moment to make the decision. Out with the meat, chicken, fish—all of it—and they never looked back. Ringo quit eating meat decades ago, too.