The Garlic Card

I saw this thing in a catalog called a garlic card and couldn't figure out what it could possibly be so I had to click on it. According to the explanation, a Swedish chef needed something to grate garlic on and for some inexplicable reason, he reached into his wallet and pulled out a credit card, which turned out to be the perfect tool on which to puree garlic. He's put out a bigger, fancier version ($6 - not too pricy) but I kind off like the idea off recycling credit cards. I wonder if it would work for grating fresh ginger as well.