This is a video of two mesmerizing 9V battery packing robots recently on display at PackExpo 2014, which, yes, is a trade show about packaging things. Just look at those robots go! Way more efficient that people. If they had actual people doing this you'd have Lucille Ball standing there with a mouthful of 9V batteries.
Keep going for the video, plus one of the best I Love Lucy scenes of all time.
Thanks to Thomas T, who I suspect is a tank engine.