June 18 BR Bullpen

The Baseball-Reference.com provides some interesting tidbits of June 18 MLB history including:
1940 - Joe Medwick of the Brooklyn Dodgers is beaned by St. Louis Cardinals pitcher Bob Bowman. Although Medwick will return from the injury in a few days, he will never regain his previous power-hitting form.
1947 - Cincinnati Reds pitcher Ewell Blackwell tosses a 6 - 0 no-hitter against the Boston Braves.
1972 - Colorful Oakland Athletics owner Charlie Finley holds baseball's first ever "Mustache Day." Finley agreed to pay $300 to each of his players for growing mustaches by Father's Day.