An actual joke that was told by Jews during World War II

An SS man says to a Jew in a concentration camp: "You are to be killed today, but I will give you a chance. One of my eyes is a glass eye. If you can guess which one it is, I will give you your life." The Jew looks at the SS man and says, "The left one, Herr Corporal." "That is correct. How did you recognize it?" "Because it looks so human."