Oh man, there's a much-told family story about my little brother and fish and eyes -- namely, as far as he was concerned, there were two kinds of fish in the world, the fish that had eyes, like aquarium fish and fish in picture books etc., and the fish that you ate. This pleasant illusion was shattered the first time he went with my mom to the fish market. "Mommy, we can't eat those fish! Those fish have eyes!"