ETA: We finally tried this, using a sealed Tupperware container instead of the two bowls. It actually works!!! But these are the catches: 1) It doesn’t work as fast on the skinny, inner cloves as it does on the fat ones. You can get those peeled too, but you have to keep shaking. 2) You have to rinse the cloves after shaking because they end up with little bits of skin all over them. Even so, it is still a remarkably easy way to peel a whole head of garlic.