The 10th grade teacher asks Jessica "What part of the human body increases to 10 times its normal size when excited?"

Jessica responds: "That's disgusting! I don't have to answer that question!"

So the teacher asks little Johnny, who responds: "That's easy... the pupil of the eye".

"That's correct, Johnny. Very good!"

And turning to Jessica, she says "I've three things to say to you, young lady...

first, you didn't do your homework;

second, you have a dirty mind;

and third, you're in for a big disappointment!"