If you think that LS3 looks less threatening and more kind of clumsy and harmless, it's only because you haven't seen it in action. Cut to 0:33 of this innocent demonstration video: The guy is walking alone in the forest when suddenly an LS3 enters the frame from the right, stalking him silently save for the quiet revving of its engine and the monotonous thud of its robot murder hooves.
Tell me you could walk into a cinema with that scene playing and think it isn't a horror movie. And tell me you wouldn't crap all the pants if you were taking your daily forest walk and saw that thing coming at you, crashing through the foliage and screaming your naaaaaaaaaaame.
Look at them happily cavorting in the field, the six men they just trampled to death but a memory of a job done well.
The LS3 is a joint project between DARPA and the Google-owned Boston Dynamics, two long-standing names in robotics whose track record of insanity includes BigDog, a perennial contender for Cracked's prestigious Thing That Is Most Likely to Murder Us in Our Sleep award. Incidentally, BigDog's development team has recently taught it to hurl cinder blocks with deadly strength and accuracy. It's probably just a matter of time before the LS3 picks up the trick and starts throwing cars at us.