Looks like BD thought of that one :)

http://www.bostondynamics.com/robot_rise.html

And to make things even worse: https://www.youtube.com/watch?v=6b4ZZQkcNEo

That's for textured surfaces only.

Until the killer robots come in the shape of flying multirotors driven by an AI.

Then just throw floss at them. (Or any other similar thin thread / line - preferably with something tied at the end to make it easier to throw)