A perfect egg sample
Common sense will tell you that one cannot determine the injury an accident victim has suffered by merely looking at the outer shell of the car. When we buy eggs, how often do we open the carton to check if the eggs on the inside are broken? Every time!

Common sense tells you that you cannot determine the condition of the egg by looking at the container. The same holds true for a person's body - the evidence is in the person's body, not the car.