A first grade teacher was having trouble with one of her students.
The teacher asks, "Johnny!  What is your problem?" Johnny says, "I'm
Too smart for the first grade.  My sister is in the third grade and I'm
smarter than she is!  I think I should be in the third grade!"
The teacher had enough.  She took Johnny to the principal's office.
While Johnny waited in the outer office, the teacher explained to the
principal what the situation was.  The principal told the teacher he
would give the boy a test and if he failed to answer any of his own questions
he was to go back to the first grade and behave.  The teacher agreed. 
Johnny is brought in the room.  The principal tells  Johnny and he agrees.

Principal: "What is 3 x 3?"
Johnny: "9"
         
Principal: "What is 6 x 6?"
Johnny: "36"

Principal: "What is 9 x 9?"
Johnny: "81"

And so it went with every question the principal thought a third
grader should know.  He looks at the teacher and tells her, "I think
Johnny can go to the third grade."
The teacher says to the principal, "Let me ask him some questions?"
The principal and Johnny both agree.
The teacher asks, "What does a cow have 4 of that I have only 2 of?" 
Johnny: "Legs."
Teacher: "What is in your pants that you have but I do not have?"
The principal's eyes open wide!  Before he could stop Johnny's expected
answer, Johnny says "Pockets."
The principal breathes a sigh of relief and tells the teacher "Put
Johnny in the fifth grade, I missed the last two questions."