Allen Lam skied on the bumper of the van last year, just never got used. Skateboarders/rollerbladers first came up with the bumper grind if you want to assign credit somewhere.
Hitting a moving vehicle has been around before and holding on/driving the van is bound to come up after you hit it once or twice(JP Auclair wall ride truck, JP Walker truck flip, Bmxer car ramp, snowboard car jump in old pin pin crew movie etc)
Other ideas that have shown up in numerous places:
Riding pallets was in Robot food's "Lame", moving box was in Japanese movie "Weird" and skate movies have done similar things.
What I'm getting at: it's inevitable for people to come up with similar ideas around the world in all action sports(similar terrain+influences+laws of physics=similar results)
To me, it's a bummer when people try to assign rules and tell you the "right way" to do something. (disclaimer: I'm about be a hypocrite)
Just have fun and don't worry too much about turning everything into a competition through ranking(especially edits/movies). If you like something, than share it with others, if you don't than don't.
(Same idea in art, although I don't consider skiing art)
P.S.
If you like strange stuff, see the Japanese snowboard movie "Weird" Probably the most appropriately named film ever made. For skating, check "Cheese and Crackers"
