You know how the foul poles at a ballfield have those screen extensions sticking out of them? Those screens were born on July 15, 1939. National League president Ford Frick ordered the two-foot screens affixed inside all foul poles following a dispute between Billy Jurges of the Giants and umpire George Magerkurth. It seems that Jurges and Magerkurth spit at each other after a disputed call down the left-field line at the Polo Grounds. The American League would install the screens on the foul poles in their own ballparks shortly thereafter.