Adam Greenberg

On this date in 2005, in his first major league at-bat, Adam Greenberg of the Cubs is struck in the back of his head by the first pitch he sees from Valerio de los Santos of the Marlins. Greenberg is forced to leave the game due to lingering effects of a concussion and never returns to the major leagues.

"You can sulk about what might have been, or you can make the best of it."