An 85-year old man is having his annual checkup. The Doctor asks him how he is feeling.
"I've got an eighteen-year old bride who's pregnant with my child. What do you think about that?"
The Doctor considers this for a moment, and then says, "Well, let me tell you a story. I know of a guy who's an avid hunter. He never misses a season.
But one day he's in a bit of a hurry and he accidentally grabs his umbrella instead of his gun.
So he's walking in the woods near a creek and suddenly spots a beaver in some brush in front of him! He raises up his umbrella, points it at the beaver and squeezed the handle. BAM !
The beaver drops dead in front of him.
"That's impossible!", says the old man in disbelief, "Someone else must have shot that beaver."
The Doctor says, "My point exactly."