The universe is chaotic. Chaos Theory, when applied to epidemiology, makes my head hurt.
What happens when two parents with type A blood give birth to a blood type B baby? Chaos. That's what. Type A parents cannot give birth to a type B baby, because genetics. But this seemed to have happened one night when I was working the lab all by myself. Was the father the baby's real father? Was the mother the baby's real mother? Did I make a mistake in typing the baby's blood? The answer probably won't surprise you, so this is more of a cautionary tale.