Guy: Doctor, my Girlfriend is pregnant, but we always use protection, and the rubber never broke. How is it possible?
Doctor: Let me tell you a story: “There was once a Hunter who always carried a gun wherever he went. One day he took out his Umbrella instead of his Gun and went out. A Lion suddenly jumped in front of him. To scare the Lion, the Hunter used the Umbrella like a Gun, and shot the Lion, then it died!
Guy: Nonsense! Someone else must have shot the Lion.
Doctor: Good! You understood the story. Next patient please.