Santa, the biology teacher, called on Neha, "Can you tell me the part of the body that, under the right conditions, expands to six times it`s normal size, and state the conditions."
Neha gasped and said in a huff, "Why, Sir ? That is an inappropriate question and my parents are going to hear of it when I get home!" She sat down, red-faced.
"Sunita, can you tell me the answer?" asked Santa.
"The pupil of the eye, under dark conditions" said Sunita.
"Correct. Now Neha, I have three things to say to you. First, you have not studied your lesson. Second, you have a dirty mind. And third, you are going to be disappointed someday!"