As more and more of us become electronic cyborgs (via pacemakers, internal drug delivery systems, etc...) the potential for detrimental hacking of those devices increases as well. See, for example, this story found via boingboing about researchers who have figured out how to hack into a pacemaker and shut it down via remote control.
I can see this being part of a plot to a movie. Some political leader dies and they think his pacemaker just gave out, but it was really an assassination. Of course, there is frightening real world potential for this.