I guess I should also add that I'm not suggesting an umpire go looking for boogers. Remember, the umpire can suspend play at any time especially to turn and direct the batter to the box
And example to what Tex is referring happened a few years ago to UCLA while Sue Enquist was still in the 3B box. Pitcher was in the circle, and the runner on 3B wondered off the base supposedly to clear a stone in the basepath. 3B umpire immediate killed the ball and declared the runner out. Now, there was no effort on the runner's behalf to advance and neither the pitcher or batter prepared for a pitch.
If I remember correctly, the coach didn't care for the call, but didn't dispute that it was the incorrect ruling.