The "stealthing" craze began at the agency's Chicago office six months ago, when the staff was relocated to a temporary space during a renovation. The open plan provided perfect fodder for art director David Estoye to set up scenes of people going about their business, with co-workers dancing madly behind their backs, all captured on digital video. "It kind of became viral within the office," Ross says. "People would ask, 'Have you been stealthed yet?' - and if you haven't been stealthed then you probably aren't cool." In late August, the clips were collected on the site, including the hilarious "Best of" compilation, as a matter of convenience, to give C-K staffers access to all the stealth footage. But then the hits started pouring in, something that Ross notes - all goofing around aside - hasn't been bad for the shop's profile. "Completely by accident it has done remarkably well for the agency's publicity, at least among the universe that matters to us."