The 10th grade teacher asks Jessica: "What part of the human body increases to 10 times it's normal size when excited?" Jessica responds: "That's disgusting! I don't have to answer that question!" So the teacher asks Billy and he responds: "That's easy...the pupil of the eye.

" "That's correct, Billy. Very good!" And turning to Jessica, she says: "I've got just 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!"