Guy : Doctor, my girlfriend is pregnant but I always use protection! How come its possible?
Doctor : “Let me tell you a story. There was once a hunter who always carries a gun wherever he goes.
One day, he took his umbrella instead of his gun and went out.
A lion suddenly jumped in front of him. In order to scare the lion, the hunter used the umbrella like a gun and shot the lion. The lion died!”
Boy : “Nonsense! Someone else must have shot the lion.”
Doctor : “Glad you understood the story!”