Coca-Cola is battling “gray-ness” with the latest installment of its “Where Will Happiness Strike Next?” global campaign that injects some unexpected joy into the dull urban surroundings. The “Roll Out Happiness” initiative masterminded by Wieden+Kennedy Amsterdam literally rolled out a piece of summer in boring «gray, grau, gri, グレー, šedá, серых» city settings of Vilnius, Lithuania in late summer.