The ninety-year-old man went to the doctor and said, “Doctor, my eighteen-year-old wife is expecting a baby.” The doctor said, “Well, let me tell you a story. A man went hunting, but instead of a gun, he picked up an umbrella by mistake. When a bear suddenly charged at his wife who was accompanying him in the woods, the man aimed the umbrella, shot the bear, and killed it!” The main said, “Impossible! Someone else must have shot the bear!” The doctor said, “My point exactly.”

There is a town in which the only barber, a man, shaves all the townsmen who do not shave themselves. Does the barber shave himself? If he does, he doesn’t. If he doesn’t, he does. Makes sense?