A middle-aged man was waiting for the bus. While he waited, he watched a young boy eat five candy bars, one right after the other.
He said to the boy, "Eating all that candy is bad for your health and can rot your teeth."
The boy replied, "Mister, my grandfather lived to be 97 years old!"
The man said, "I'll bet he didn't eat five candy bars in a row."
The boy answered, "No, but he sure knew how to mind his own business!"