There is an old Indian legend that says that in the beginning of the world men had four arms and four feet. They had such a high opinion of themselves they thought they were as good as the Great Spirit. This got the Great Spirit’s goat, naturally, so he took a knife and sliced them down the middle. Well, right away the two halves wanted to get together again, and their longing was the first love in the world. They dragged around till one day they met the Spirit of Fire and he asked what was the matter, for he saw they were down in the dumps. “We want you to sear us with flame,” they said, “melt us into one, for that is our only desire on earth.” So the Spirit of Fire took pity on them and did what they asked. And ever since, all the unconnected halves running around want to be seared with flame and melted together.
--From Variation West