Turns out every time you waggled a remote to play tennis or swing Link's sword, there was a Goomba pulling the strings. Who would've thought?
JUST KIDDING. This is actually a homemade case mod, designed by Kotaku reader lyberty5. Your Wii does not have a Goomba infestation.
"To pull off this mod I had to remove the disc drive and cut out parts of the inside of the case with a Dremel," lyberty5 tells us. "This was made possible by using a chip that allows to play games I own through SD cards."
Here's a video showing how he did it: