Late one night at the insane asylum one inmate shouted, "I am Napoleon!"

Another one said, "How do you know?"

The first inmate said, "God told me!"

Just then, a voice from another room shouted, "I did not!"

The student asked, "Do you know who I am?"
The professor said, "No and I don't care."
The student asked again, "Are you sure you don't know who I am?"

The professor again said no. So the student walked over to the pile of tests, placed his in the middle, then threw the papers in the air.

"Good" the student said, and walked out. He passed.