A man showed his new computer to his friend, and said that it could answer any question whatsoever.
The friend said that is impossible, there is no such computer on earth.
The man said, you test this one.
The friend asked the computer " Where is my father ? "
The computer replied " Your father is fishing in Switzerland "
The friend said angrily " You fool, don't you know my father is dead "
The computer replied " You bloody fool. It is your mother's husband who is dead. Your father is fishing in Switzerland "