Though I would have absolutly no purpose for one of these, it would certainly be fun to play with. I think the guy is crazy to think of fighting someone else with one though. You would sudden jolt that you would get when someone hit your machine would probably feel just like a car wreck.
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http://news.com.com/Giant+robots+in+the+backyard/2100-1026_3-5499730.html?tag=nefd.hed