Is there an algorithm to generate a lightning bolt?

I would like an algorithm that generates a list of segment or point objects specifying where the bolt will land. The method would need a start point parameter, along with an endpoint. The bolt should have random branches coming off it, and zig-zag at random intervals. The result will be a random lightning effect that would look somewhat like this

_{(source: wikimedia.org)}

If anyone knows of an algorithm that this may work for, help would be greatly appreciated!