On the last day of kindergarten, all the children brought presents for their teacher. The florist's son handed the teacher a gift. She shook it, held it up and said, "I bet I know what it is - it's some flowers!"

The farmer and his wife had worked hard, scrimped and saved to send their son to college. As soon as he had enroled, he started to grow a beard. Next he grew a large moustache and sideburns. 

The graduate with a Science degree asks, "Why does it work?"

The graduate with an Engineering degree asks, "How does it work?" 

The male teacher in a girls' school asked the science class: "Who can tell me what organ of the human body expands to 10 times its usual size when stimulated? Mary, can you tell me?"