No one answered until 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 tell the principal, who will then fire you!"

Mrs. Parks ignored her and asked the question again, "Which body part increases to 10 times its size when stimulated?"

Mary's mouth fell open, "Boy, she is going to get in big trouble!"

The teacher ignored her again and continued, "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."

She then turned to Mary and said, "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."