221 said what I was going to write myself...
'Chaos theory' is just a cop-out for people who don't understand some of the stranger (but still proven) laws of physics. It turns out that space is quantized (there is a minimum measurement of length, a cap on the complexity of the universe), so there is no 'chaos'... there's actually a cause for everything. Sure, a butterfly can flap it's wings and cause a hurricane... that's not 'chaos'. There's an obvious cause and a valid effect- the butterfly's flap was the final straw on the donkey's back. If we could build a computer capable of simulating the universe, we would see that concrete mathematical laws govern this effect, and not 'chaos'.
The problem comes from the uncertainty principle- by observing a particle, we will always alter its state, so we could never actually build a correct model to predict the future, even if we had a computer capable of simulating the entire universe (which is impossible anyway, because we would need a space the size of the universe to process that much information).
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My bunghole it goes RRRACACACAAA