A woman is going to give birth soon...

...but the doctors find out that she will die of pain during childbirth.
She and her husband are mortified.
So, a scientist invents a machine that can share the pain between the father and mother of the baby, so she won't die.
Two days later, the woman is in the delivery room, while hooked up to the machine.
"Shouldn't I be hooked up, too?" says the husband.
"Don't worry," the scientist replies, "the machine automatically syncs up with the father."
The woman starts to push, while, as expected, is going through a lot of pain.
The husband says "Alright! I'm ready! Divert 10% of the pain to me!"
Nothing happens. The machine is whirring, but he doesn't feel anything.
"20%!"
Nothing.
"30%!"
Still nothing, although the wife doesn't seem to be in as much pain.
This continues until the machine is at 90%. The man is scared the machine will spike out if he puts it on 100%, resulting in his death, but he's willing to risk his life for his wife's.
"100%!"
The man *still* feels nothing, but neither does the wife.
Confused, this scientist explains he must've made an error, and the machine simply takes the pain away.
After the delivery of the baby, the couple drive home...
...where they find the Milkman dead on the front porch.