Just when they were really getting into it, their young son entered the room and started to cry.

"What's wrong son?" the father asked, "Why are you crying?"

"You're hurting my mommy" the little boy replied.

"No, no..." the father reassured, "I'm not hurting mommy. We are making babies."

This seemed to calm the boy and when he left the room the couple went back to their business.

The next day the father came home from work and found his son on the steps crying.

"What's the matter now? asked the father.

His son replied, "Its those babies you were making with mommy yesterday... The mailman is upstairs eating them!!!"