Kersh

Nope, happened in our Men's league softball game. There was so much activity on the play that no one noticed the guy slip from the first base coach's box onto first base. no one really noticed until there was the play at the plate on him. Not a beer drinker's league either, most everyone, or at least a large number from each team has played organized baseball after high school too.

It is still a live ball and in play. The batter is not awarded first by a Hit by Pitch, because the ball hit something in the field of play other than the ground, in this case the backstop. The same ruling would apply if it hit the catcher's mitt, or any of his protective gear and ricocheted back hitting the batter.