After marrying a much younger woman, a 93-year-old man visited his doctor and announced that they were expecting a baby.
Let me tell you a story, said the doctor. An absent-minded fellow went hunting, but instead of a gun, he picked up an umbrella. Suddenly a lion charged him. Pointing his umbrella at the lion, he shot and killed the animal on the spot.
Impossible! exclaimed the old man. Somebody else must have shot!
Exactly, replied the doctor.