The play of corvids (crows, magpies, ravens, etc.) is pretty well documented. They seem to like sliding or rolling down snowy slopes. It could be some way of bathing themselves but surely just plunging into snow would be more effective. It's also common to see them using twigs as tools. Put it all together and it seems plausible to me that one of them could have learned to snowboard.

I agree it's important to remember that the bird has a mind separated from ours by millions of years. But, at times like this, I like to recall this story about Chinese philosopher Chuang Tzu.

http://home.earthlink.net/~bchaney/ty/joy-of-fishes.htm