A teacher wanted to test his student on historical facts.

The teacher asked,"Once, someone asked Napolean Bonaparre for the meaning of the word 'impossible'. How do you think Napolean answered him?"

The nervous student looked at the teacher blankly. He knew nothing about history. But nvertheless he murmured something but the teacher could not hear.

"What did you say? Can u speak louder? I cannot hear u,"said teh teacher.

The student then plucked up his courage.

"I don't know," he blurted out loud.

"Absolutely right!" the teacher exclaimed. "You have given the right answer. Napolean said,"I don't know because there is no such word in my vocabulary."