The Russian and the American presidents are walking along the beach. They start
discussing their submarines.

The Russian president says, We recently have made much progress with our
submarines. They can now stay as long under water as yours, for one month.

The American president replies, Do you not think that we also made progress?
Our submarines can now stay under water for two months.

Shortly after this discussion they hear some strange sound coming from the sea.
Suddenly a old fashioned looking submarine appears. A hatch opens and a
uniformed man appears, Heil Hitler, meine Herren. Can you tell me whether the
war is already over?