Not really that strange, alot of people
don't know that what a hen eats won't come out in the egg. I let my grand childern use an incubator in the class room. One day while I was there, a chick pecked at a pile of poop. Seeing this one classmate went crazy, yelling that he would never eat chicken again. If a person was to follow a chicken around and watched what it ate while free ranging, they might never eat eggs again. In both Sacramento and Reno (the school distracts where the kids are), you ask the class where eggs come from and they will answer,
the store. They have no idea that they come from a chicken. Not just grade school, two in high school. One of the other parent was there as a hen laid an egg. She saw the area it came out of and stated she would never eat another egg. Thinking it came from the butt and not the vent.