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From Gizmodo this Wii commercial was done unofficialy by  Super 78 a professional CGI movie company.

Here is some words about it from the creator

I really love the Wii and I had been reading these stories about Wii controllers flying out of peoples hands. We had some down time at the office so I got together with one of the animators and I sketched out a storyboard of the spot. In the board the controller is this high energy maniac and the nun-chuck just wants to get away. So our most talented animator Michael Smith created this fun spot there is a lot of character…This was done by us, Super 78, using our own resources, no agency was involved, no money changed hands. I am hoping that you could post it so we can see if it catches fire.