My theory on that one is as follows: Pakistan and India go to war, china comes in for Pakistan, U.S. comes in for India. Then N. Korea, Free China, Japan, and all of Asia get involved, the Arabs will also start a war with Israel and get their rears kiked.
I think that there is a possibility of the World War 3 occurring. This is because of the various conflicts taking place in the world today. According some sources, the countries that could be involved in this are Germany, China and the US. You can get some information on http://en.wikipedia.org/wiki/World_War_III.