My dark side is thinking of a virus, let's call it YouGoToJail, that encrypts a file (say with gunpg - 4mb and works on all OSes) with a random very long password. The virus then deletes all traces to itself. You go to jail!
And just before it deletes itself it posts threatening messages via your twitter and facebook account, designed to trigger the automated systems presumably watching these, thereby triggering an investigation into your affairs.
YouGoToJail indeed.
Would the virus actually delete itself by writing over the data? If not, it would be possible to detect that the suspect had the virus.
It would be nice to see such a virus targeted at everyone in parliament.