A man was sitting by a lake. He was throwing small pebbles into it from time to time. A young boy happened to cross by. He was intrigued to see that after every few minutes or so, the man would toss a pebble into the lake.
The boy went up to the man and said, "Good pastime, this stone throwing, he?" "Hmmm," said the man. He seemed to be deep in thought and obviously did not wish to be disturbed.
