Oh yeah, I've seen that clip. It always ends badly for the showboater, doesn't it. But realistically, how else are you going to get the ball off of him? Most anything you do will be dangerous play.
There was a lot of debate after that FA Cup match about whether Nani's move was just an entertaining piece of flair, or was intended to humiliate Arsenal. Obviously I'm biased, but it felt like the latter to me.