It would be easy to bring Google down, all you need to do is find how they make their money and then interrupt it, well they make their money by people clicking on links, so there total trust to their income is in the companies paying Google for PPC, now if for some reason lots of people just started click these links for no reason at all say every link they find, then Google’s PPC would collapse. However I would not in carriage this as I think Google is great.