Elon Musk just gave people a powerful and eerie visual related to his belief that Artificial Intelligence (AI) could usher in a SkyNet style apocalypse where the machines take over and kill us all. 

In a talk given last July, Musk said, "I keep sounding the alarm bell but until people see robots going down the street killing people, they don't know how to react because it seems so ethereal."

On Sunday Musk took to twitter to vividly illustrate his point, retweeting a creepy viral video which showcases the DARPA-funded Boston Dynamics "Atlas" military robot's astounding ability to do a back flip – something which researchers have called "bonkers" for the shocking and unexpected compounding leaps in development of humanoid robot technology that Atlas represents.