Is that clip a real or just a prank?

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Please check this video out while I was browsing at youtube. It will be the the funniest video for the day. I couldn't imagine Hillary Clinton embarrassed herself in front of the national tv, she farts. especially during the debate. It is natural, but a little bit of out of line. She should say something about "excuse me." Check this out: http://www.youtube.com/watch?v=DlkxQMxJmEU