I was already familiar with most of the techniques but I never understood how they did that last one. Now I do!
[video=youtube;-u6Kqmvs4TU]http://www.youtube.com/watch?v=-u6Kqmvs4TU[/video]
[video=youtube;-u6Kqmvs4TU]http://www.youtube.com/watch?v=-u6Kqmvs4TU[/video]