Getting closer to the first self-propagating worm. It'll happen eventually. Still, five years into OS X and we're still waiting for the first one.
(Denny Crane: "I Don't Want To Socialize With A Pinko Liberal Democrat Commie. Say What You Like About Republicans. We Stick To Our Convictions. Even When We Know We're Dead Wrong.")
Why not issue a challenge for someone to develop such a worm or virus? That would prove interesting.