PRIMORDIAL DIGITAL SOUP. “What would happen, McCaskill had wondered, if one made a soup of Turing machines and let them collide; one collision partner would act as the machine, and the other partner in the collision would act as the input tape. The soup of programs would act on itself, rewriting each other’s programs until… Until what? Well, it didn’t work. Many Turing machine programs are able to enter infinite loop and “hang.”
http://www.panspermia.org/computrs.htm