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it was linked from popsci.com, not that that makes it true, but it does provide a measure of credibility that you typical blog might lack.
Their reactions didn't appear to be genuine, especially at the 14 second mark, plus the reaction at the 22 second mark is a full second later than you'd expect if it were real. Those are my main reasons for leaning toward FAKE. So it's not just me...
Nobody noticed that these are the same guys who cut a 2 X 4 by throwing a saw blade at it? They have quite a few of videos like this. Just follow the "this is a video response to" links to view others. Somebody tell me that these aren't fake. The reaction in the 2nd one is just horrible. <object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/WSNgd4PU7ZY&hl=en_US&fs=1&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/WSNgd4PU7ZY&hl=en_US&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="560" height="340"></embed></object> <object width="560" height="340"><param name="movie" value="http://www.youtube.com/v/wy4-4NOjLYI&hl=en_US&fs=1&rel=0"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/wy4-4NOjLYI&hl=en_US&fs=1&rel=0" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="560" height="340"></embed></object>