These guys hit this ball with their feet in any position, and they literally fly upside down at times. I have never seen anything like it, it's very exciting. This is on television here in Asia, but I had never seen or heard of this in the U.S.
UPDATE: There is a You Tube video of this to check out, the Busan Asian Games, Busan is actually in South Korea. http://www.youtube.com/watch?v=LXmjOMUdsPY, It's not the most amazing action I've ever seen, but if someone has never seen this, go there now.
There's also a youtube video of some guys in Minnesota USA messing around, but they look like they might have Asian heritage, maybe that's why they knew about it.