That was a hilarious video, the coffee table at the end did it for me. awesome   And that door bouncing along,  just priceless.
I still think this could totally be done on skis though, it would just take large skis and someone with balls big enough to try it on one of those large waves like in that first vid posted.  The whole reason they tow in to big waves is that they are going too fast to paddle into, faster is better for standing on waterskis, slater(or whoever) in your video tried waterskis on a small wave(slow).  Plus I don't know anything about him but that guy who tried it there has probably been surfing his whole life and isn't that good on waterskis.
And for all those saying leave surfing in the sea and skiing in the mountains, how bout a little progression between sports, what the hell is snowboarding anyway, or even skating.  It's just somebody who loved their sport enough to try it in a different situation.