the hunter
A 90 years old impotent man goes to a doctor . old man: Doctor, my 28 years old wife is pregnant, what's your opinion?
Doctor: let me tell you a story. A hunter in a hurry grabs an umbrella instead of his hunting rifle. He moves in to the jungle, sees a lion, lifts the umbrella pulls the handle and .... Bang it the lion drops dead.
Old man: that's impossible! Someone else must have shot the lion
Doctor: xactly my opinion
Hahaha this is a really funny one. The old man most certainly got the point