Finally, a milkshake that looks like Grimace! Who, if you didn't know, was introduced to the McDonaldland line of mascot characters as the guy who wanted to steal all of the milkshakes from McDonald's. He also had six arms, too. And was evil, hence the stealing part. Check it out:But we digress. Besides looking like Grimace himself, this recent addition to the Japanese McDonald's menu (which is arguably where all the best stuff is) celebrates the coming of autumn with the taste of sweet potatoes (not yams, mind), a fall favorite in Japan. However, it's only due to be around until late October.