Funny post Robin! Your stories reminded me of two times when my kids were little. My daughter screamed and threw a tantrum when I tried to give her a bubble bath, and I found out years later that she was terrified of the Mr. Bubble on the picture of the bubble bath box. She thought he was going to reach up through the bubbles and grab her.
Once when I forgot to leave tooth fairy money under my son’s pillow he stomped downstairs next morning with a baseball bat and an enraged expression on his little face. When I asked him what he was doing he said “I’m going to whack that tooth fairy. She didn’t leave me any money!”