A man took his pregnant wife to the hospital to give birth, and the
doctor told them that he'd developed a new machine and asked if they'd
like to try it out. The machine could take some of the pain of
childbirth from the mother and give it to the father to ease the
mother's burden.

Well, they thought that was a good idea and decided to give it a try,
so the doctor set it on 10% to begin with, telling the man that even
10% was probably more pain than he'd ever experienced. But the man was
surprised at how little pain he was feeling and asked the doctor to
raise it. So he put it up to 20% and when the man still felt fine, he
raised it to 50% and finally 100%. After it was over, the man stood up,
stretched a little. Both he and his wife felt fine. The wife was
relieved at having an almost painless labor.

Later, when they took the baby home, they found the mailman dead on
their doorstep.