The jobs number is a useful reminder that while there are smart economists inside and outside the Federal Reserve, Mr. Market is capable of outsmarting them all.
Instead, it's typically a more prosaic end: humanity wiped out because an AI tasked with a simple goal (say, creating paper clips, an example that is often used) requisitions all the energy and raw materials on Earth to relentlessly churn out paper clips, outsmarting and out-maneuvering all human attempts to stop it.