Nabisco Biscuit Co. gives dunkers an extra thrill with limited-edition Oreo Magic Dunkers, which contains food coloring that turns milk blue. FCB Worldwide, New York, today breaks a :30 in which a bovine couple huffs at why kids would want to change the color of their milk. Strangely, one of the cows appears to be a male. The ad was directed by Sussan Group's Frank Samuel. Copywriter: Liza Powell. Art director: Jen MacFarlane.