I saw it happen at East Devon last year.
I was staring into space about 10 - 12 yards out into the lane while my shooting partner prepared to shoot a full size kill at about 35 yards (sitting)
It was raining, but there were also some extra large drops falling from the trees. As he fired I saw a flash of "steam" from the pellet hitting a water droplet right where I was staring and it deflected his pellet enough for it to miss the faceplate completely!
I guess an unlucky insect could cause the same sort of deflection?
Anschutz 2013 MEC1 .22LR
Miroku 3800 12bore