"Why is it that three of our four children have black hair but little Jim is a blond? Whose child is Jim?"
"I can't tell you the truth," said his wife after a long pause. "It would hurt you too much."
"Oh, don't be ridiculous," he insisted. "I don't mind who the father is. I'm just curious."
The wife finally confessed. "Well, if you really want to know, Jim is your child."