Baseball, like any sport, has its risks and dangers associated with it. The players aren't tackling each other many times a game like in football, but there is always the risk of injury.
Perhaps, the worst thing to see happen is a pitcher get nailed by a comeback pitch. Often, there's no time to react to it with how fast the ball is traveling, and it can knock a pitcher out of a team's lineup indefinitely.
Here are 40 of the most horrific comebackers in baseball history.