Like Red Bull Camouflaged in a slim new can reminiscent of red-hot Red Bull, Coca-Cola Co.'s flagship has been making the rounds among the chic elite during an underground test at select Manhattan clubs and boutiques. The slender 8.4-oz. can, which borrows the cachet of energy drinks and looks hipper than its stubby 12-ounce cylindrical sibling, also was spotted at last month's celebrity-soaked American Music Awards.