Quite the Good Guess

The teacher noticed that Al had been daydreaming for a long time. She decided to get his attention. " Al," she said, "If the world is 25,000 miles around and eggs are sixty cents a dozen, how old am I? " Thirty-four," Al answered unhesitatingly. The teacher replied, "Well, that's not far from my actual age. Tell me... how did you guess?" "Oh, there's nothing to it," Al said. "My big sister is seventeen and she's only half-crazy."
 

Meeting Plato

In a classroom pupils were asked to always write in silence. One day the teacher dozed off and was awakened by some of the pupils making noise. To cover her embarrassment she said, "It was always my wish to meet the scholar Plato and, a while ago, I did see him in my dream." The next day a pupil dozed off while listening to the teacher's long lecture. Upon seeing the sleeping child, the teacher woke him up and rebuked him. "Why are you sleeping during the lecture?" The pupil answered, "I also went to see the scholar Plato." The teacher asked, "And what did Plato say?" to which the pupil replied, "Plato said he did not meet with you yesterday."

Great Plains

Teacher: What are the Great Plains?
Pupil: 747, Concorde and F-16!