Just for a laff !

A sixth grade science teacher, Mrs Parks, asked her class, "Which human body part increases to 10 times its size when stimulated?"
No one answered until Mary stood up and said, "You shouldn't be asking kids of our age questions like that, I am gonna tell me parents who will report you to the head and then you'll be fired!"
Mrs Parks ignores her and asks once again, "C'mon now, which body part increases to 10 times its size when stimulated?"
Mary's mouth gapes wide open and say's to the class, "She is heading for mighty big trouble!"
Teacher ignores her again and addresses the class again, "Anybody gonna give me the correct answer?"
Finally Billy stands up and nervously says, " The body part that increases by 10 times its size when stimulated is the pupil of the eye."
Mrs Parks responded, "Very good Billy." She then turns to Mary and continues,"As for you young lady, One you have a dirty mind. Two, you didn't read your homework and three, one day you are going to be a very, very disappointed woman!"