Little Mary stood up and said, 'You should not be asking sixth-graders a question like that!
I'm going to tell my parents, and they will go and tell the principal, who will then fire you!'

Mrs. Parks ignored her and asked the question again.
Little Mary's mouth fell open.
Then she said to those around her, 'Boy, is she going to get in big trouble!'

The teacher continued to ignore her and said to the class, 'Anybody?'

Finally, Billy stood up, looked around nervously, and said,
'The body part that increases 10 times its size when stimulated is the pupil of the eye.'
Mrs. Parks said, 'Very good, Billy,'
then turned to Mary and continued. 'As for you, young lady, I have three things to say:

One, you have a dirty mind
Two, you didn't read your homework.
And three, one day you are going to be very, very disappointed.'