In 1925, a golfer's ball moved a fraction of an inch in the rough. Nobody else on the course saw it happen. He called a penalty on himself anyway — and it ended up costing him the U.S. Open.

Today I get into why that's actually the deepest version of "controlling the controllables" you'll ever find in golf, and why we're still telling this story a hundred years later while almost nobody remembers who actually won that tournament.