My favorite negative outcome from self replicating probes is the kind that are sent out to investigate the universe, and report back to a location some millions

My favorite negative outcome from self replicating probes is the kind that are sent out to investigate the universe, and report back to a location some millions of years later to report. Except too many of them have been built, and when they show up, gravity is too much, and they form a black hole. For whatever reason, that's just funny to me.