I heard this story from a father once. It has a very good lesson: A scorpion walks along the side of a stream, wondering how to get across. A fox comes along and the scorpion asks, "Hey, will you take me across the stream?" The fox replies, "No, you'll sting me!" The scorpion assures him, "If I stung you, we would both drown!" The fox thinks about it for a bit and eventually agrees. The scorpion hops on his back and the fox starts swimming. About halfway through, the scorpion stings the fox. As the poison fills his lungs, the fox asks, "Why did you do that?" The scorpion replies, "I couldn't help it. It's my nature."