Remember back in the first Robocop movie, there was this giant robot like a walking tank with a gun on each arm? During one scene, it went nuts, started moving around on it's own and killed some guy (giving him a count down, then ignoring his surrender), setting it up as a villain for the hero to fight.
Well, some genius working for the US army decided a robot carrying a gun was a brilliant idea and three of them were deployed in Iraq. They were pulled back in almost immediately. Guess why? One of them started moving around on it's own. Did these people not see the movie and forget to test for something like that??
Fortunately these real life robots didn't get to shoot anyone.
http://blog.wired.com/gadgets/2008/04/k ... ot-pu.html