I'm a member of youtube and have made some comments on this (I'm muskndusk) and have requested that it be flagged (see the little cross underneath the video). I was appalled by some of the other comments to this video. I don't think it's fake, as the cats' reactions are too well timed with the shouting. Even if it is fake, the message it puts across is: if you're angry, take it out on defenceless (probably declawed) cats.
It's a shame that youtube allow the posting of the horrible videos, I know there are far worse than this, and avoid them. In many other ways it's a great vid forum; I love trying to find vids of old songs.
The best we can do is join and make a flagging request. DON'T WATCH THE VIDEO BEFORE DOING THIS BECAUSE IT WILL PUT UP THE VIEWING RATING OF THIS VIDEO.