Actually, it's Asimov's 'Multivac' stories that this thread brings to my mind.
In one story, Multivac, the world's largest supercomputer, is given the responsibility of analyzing the entire sum of data on the planet Earth. It is used to determine solutions to economic, social and political problems, as well as more specific crises as they arise. It receives a precise set of data on every citizen of the world, extrapolating the future actions of humanity based upon personality, history, and desires of every human being; leading to an almost complete cessation of poverty, war and political crisis.
However, Multivac harbours its own desire, and to achieve it engineers the actions of one human...
Hehe, in another story, an interaction between Multivac and two drunken computer operators has HUGE implications billions of years down the line. So, easy as you go, guys!