I found a link to this tantalising video on the Luxembourg Water Ski and Wakeboard Federation Facebook page.

It's a news report on Luxembourg TV about what I think may be the national Wakeboarding championships: http://tele.rtl.lu/waatleeft/replay/v/20100831/0/24217/

Wakeboarding is similar to water skiing, but a little trendier!

I don't speak the language  - could anyone translate for me?