A man was driving through a forest on an empty rural road.  Suddenly, he came upon an intersection, where he saw a sign.  The sign said: "If you go left, you will lose your life.  If you go right, you will lose everything you own.  If you go straight, you will lose your intelligence."  The man thought: "I'm not a scientist, so I'll go straight".  It turned out to be a very long road.  It was getting late, and there were no motels or even gas stations around anywhere.  

Suddenly, he came across a farmhouse.  He knocked on the door, and an old, homely-looking woman answered.  The man explained his situation, and asked if he could stay for the night.  The woman agreed, and asked him: "Where would you like to sleep: with me, with my daughter, or in the barn?"  The man looked at the old woman, decided that her daughter wouldn't be much better-looking, and chose to sleep in the barn.

He woke up late next morning.  As he went outside to stretch his legs, he saw a gorgeous-looking young woman laying in the sun.  Mesmerized by her looks, he approached and said: "Wow, I haven't seen you here last night."  The young woman responded: "Well, I'm the daughter of the old woman who lives here", with a sexy smile on her face.  The man started slapping himself on the forehead and yelling: "I'm so stupid!  I'm so stupid!"