A father didn't know where his son was stationed, locations being classified during wartime. After a week, he got the first letter from his son. It read: I can't tell you where I am, but yesterday I shot a polar bear.
A week later, another letter came: I can't tell you where I am, but yesterday I danced with a hula girl.
Two weeks later, a third letter: I can't tell you where I am, but yesterday a doctor said I should have danced with the polar bear and shot the hula girl.