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.”
