"Professor" joke

One morning as Professor Jones was leaving for the university his wife told her absent-minded husband, "Don't forget we are moving today. If you come to this house this afternoon it will be empty."

Predictably he didn't remember until he found the house vacated that afternoon. He mumbled to himself, "And where was it we were moving to?"

He went out in front of the house and asked a little girl, "Did you see a moving van here today, little girl?"

"Yes," she replied.

"Would you know which way it went?"

She looked up at him and said, "Yes, Daddy, I'll show you."