This interesting Russian flash movie is a demonstration of rag-doll physics, something that is currently being used in video games. Each body part is given weight as well as motion that is restricted to natural movement and then set loose into a physics engine. In this demo, the only real force is gravity. The result is something that looks like a rag doll being thrown around.
If you hold down the mouse button and drag the pointer, you can pull the rag-doll around.
ahh~
FREAKY joints!