Having scandal

This joke is rated 18s*x:

An 80 year old man went to see a doctor and asked :

Old Man : My 28 year old wife is pregnant, your opinion Doctor?
Doctor : Let me tell you a story. A hunter in a hurry grabs an umbrella instead of the gun. He moves into the jungle, sees a lion, lifts the umbrella, pulls the handle and BANG... The lion drops dead!
Old man : That's impossible, someone else must have shot the lion.
Doctor : MY POINT EXACTLY!