My young (14years??) nephew thought that fertilised chicken eggs were made by the rooster going around and sitting on the eggs and "injecting" them. My farm-wise son put him right, however he insisted for some time that his mother had agreed this "was probably how it happened". I think that might be a lesson in listening to your children properly.
A childhood belief about reproduction

others believed things like this
- In my youth,I was always convinced that my chocolate easter eggs came from my uncles chicken farm!— Jamsie
- I used to believe that only brown eggs came from chickens. I thought white eggs were made at the store— Destiny
- When I was a kid, I used to believe that cadbury cream eggs real uncooked eggs in the middle Anon
- I used to believe rabbits could lay eggs. See what Easter is doing to our children? lies! lie I tell you!— Kitty Kat
- My Dad told me that the big bales of hay wrapped in plastic sitting in the fields on farms were cow eggs.Anon
- I used to believe that bunny rabbits hatched from eggs, since the Easter Bunny gave you eggs.— goat