I was just goofing around on youtube when I came across this video. It's really cool and I've never seen this done, or at least paid attention. So I was wondering if they still do this or is this another thing of the past?
http://www.youtube.com/watch?v=78nkGL231dQ&feature=related
http://www.youtube.com/watch?v=78nkGL231dQ&feature=related