Back when I was a senior in high school I did chain crew for a few games, and that planted the seed for officiating later. I think it was in the first game I did, I made that mistake. The referee had flagged the other team for a late hit out of bounds, though the defender had basically wrapped his arms around the ball carrier and followed him out of bounds, and no hit was made and nobody went to the ground.
I made the mistake of saying out loud, "We'll take it, but that was a terrible call." He turned around and gave me the look of death. Never did it again.