Cheatin' Johnny

In class one day, Mr. Johnson pulled Johnny over to his desk after a test, and said:
"Johnny I have a feeling that you have been cheating on your tests."

Johnny was astounded and asked Mr. Johnson to prove it. Well, said Mr. Johnson, I was looking over your test and the question was, "Who was our first president?", and the little girl that sits next to you, Mary, put "George Washington", and so did you.

So, everyone knows that he was the first president. Well, just wait a minute, said Mr. Johnson. The next question was, "Who freed the slaves?" Mary put Abraham Lincoln and so did you.

Well, I read the history book last night and I remembered that, said Johnny. Wait, wait, said Mr. Johnson. The next question was, "Who was president during the Louisiana Purchase?" Mary put "I don't know", and you put, "Me neither"