The DLR Hand Arm System is perhaps the most advanced in the world. It's also, thanks to artificial kevlar tendons, one of the strongest. So how do you test that out? Smash the shit out of it with a bat.

The German arm's incredibly design allows it to absorb and evenly distribute major shock while still functioning perfectly. And really, any robo-arm that's got a future in the real world is going to have to take some serious knocks, just like any human arm. I'm sure the gentleman above truly loves his robot pal, but man, the look on his face afterwards... [IEEE Spectrum via PopSci]