 SPOILER: The part of the movie in which Rannulphs ball moves and  the officials are trying to get him to say it was a trick of the  light or that he imagined it, is based on a real incident that  involved Bobby Jones (III) (qv) and Walter Hagen (qv). In 1925,  Bobby Jones was challenging for the U.S. Open Championship at  Worcester Country Club in Worcester, Mass. On the 11th hole, as he  addressed his ball in the rough, it appeared to move. It was  determined that no one else saw the infraction, including his fellow  competitors Gene Sarazen (qv) and Walter Hagen, and the marshals  left it up to Jones as to whether a foul should be called. Jones  called the breach on himself and after the marshal announced the  stunning act of sportsmanship to the crowd, Jones replied: "Do you  commend a bank robber for not robbing a bank? No, you dont. This is  how the game of golf should be played at all times." He eventually  lost the U.S. Open by one stroke.