I was in awe while also being completely terrified. It didn't take Black Mirror or a viral ad to convince me that autonomous weapon systems are bad. I grew up watching Terminator and RoboCop. My first thought when seeing BigDog was "this is awesome but also we're all going to die".
When people didn't get it, I just showed them Petman: https://www.youtube.com/watch?v=tFrjrgBV8K0