Gregory Arkadin: A scorpion wanted to cross a river, so he asked the frog to carry him. The frog refused because the scorpion would sting him. That would not be logical, explained the scorpion, because if he stung the frog they would both drown. So the frog agreed to carry the scorpion. Half way across, the frog felt a terrible pain - the scorpion had stung him. There is no logic in this, exclaimed the frog. I know, replied the scorpion, but I cannot help it - it is my nature.