“One day I saw the combative Giants shortstop Billy Jurges confront umpire George Magerkurth, on a call Jurges violently objected to, the two men standing jaw to jaw, raging invective at each other. A faint spray of saliva emitted from Magerkurth's mouth; Jurges stepped back and uncorked his own oyster of spittle, right in the umpire's face. Magerkurth slugged Jurges, who slugged him back, and the two men rolled on the infield grass, clawing at each other until they were pried apart. Jurges, of course, was tossed out of the game and suspended for a spell, his place at shortstop taken over by the mild-mannered prematurely gray utility infielder, Lou Chiozza. The very next day, Chiozza ran out to short left field, chasing a pop fly, while in rushed Joe Moore, from his left field post. The result was a noisy collision, which sent Chiozza to the hospital, marking the first and only time one player's spittle had broken another player's leg.”

From his Foreword https://books.google.com/books?id=jF7v30gqs_0C&amp;pg=PA8 to The Early Polo Grounds (2009) by Chris Epting <br class="br">Sports-related