Once a great scientist invents a machine and claims that it can tell
everything about everybody, when asked. Nobody believes him. So,he holds
a press conference, where anybody can ask any question from the
machine.
In the press conference, many people ask the machine
different questions and the machine answers them correctly. The news
spreads like a wild fire and finally reaches the ears of President of
U.S.A. He calls the scientist to Pentagon and asks him to bring his
machine with his machine. All the officials of Pentagon are present in
the meeting to ask questions from the machine.It answers all of them
correctly.
Finally,the President asks one question "What is my
father doing at present?". The machine falls silent for few minutes and
after that, answers "Your father is fishing in Arabian Sea.".The
President starts laughing and after five minutes,when he stops
laughing,says "Your machine is of no use scientist. It was a trick
question. My father died 4 years ago.".
The scientist apologizes
and asks President to reframe the question so that the machine could
understand the question better. So the President asks "What is my
mother's husband doing at present?". After some time, the machine
replies "Your mother's husband died 4 years ago but your father is still
fishing in Arabian Sea".