I had a friend send me a URL today that was a presentation on STUXNET. Following that presentation are many other presentations that will probably also suck you into watching them.
We are now living in a very early stage of a digital world. We have gotten there quickly and many of our processes are naive and assume that the world is honest and trustworthy.
However, as we have seen, with the virus attacks on PCs, that the world is changing and these are just the initial stages. If you want to scare the $*&T out of yourself, just watch the following presentation and others that might grab your eye.