All I can say is this is an epic FAIL <object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/_OWsEtPrQGM&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/_OWsEtPrQGM&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
Gotta be fake. Notice how there just happened to be something behind him to fall back on that would keep his head and upper body in frame.
I dunno, you can also clearly see a flash of light from the taser. Unless they now sell lightsabres in taser guns?
I don't think the taser actually touched his hand, and even if it did, I don't think it would knock you out like that.
after reading all the comments just figured it would be something more entertaining. looked totally fake. but eh.