There were 141 balks committed in the 2015 season. They're not extremely rare, but they're also not something that happens every game. However, on May 3, 1950, balks were plentiful.
Vic Raschi was a four-time All-Star pitcher for the Yankees who received MVP votes in five seasons. He was part of the Pinstripe Alley Top 100 Yankees series and he was a good pitcher. In 1950, Raschi would have one of his All-Star seasons. On May 3, 1950, he made his third start of the season. The Yankees had gotten off to a 6-4 start in a season that would end with a World Series win.