I've always figured it's very much a hollywood thing. Come to think of it, it does seem to be in quite a few movies/games; The Matrix, pretty much any Chow Yun-Fat movie, Max Payne video game, etc. I mean, it's possible to pratice a lot and become somewhat adequate with it, but what's the point. I figure it's much better to have one weapon and have control of it. That way the person will actually be able to hit something that's more than a couple of meters away lol.
http://www.youtube.com/watch?v=9q4zv2QGdos