Invisible Subway Train Freaks Out Riders in This Great, Ghostly Ad Prank

Clever work from Shackleton

Here’s a freaky little ad stunt from Spanish agency Shackleton. The agency installed loudspeakers and hidden cameras in the busiest subway station in Madrid, and then played sounds that accurately reproduced those of an arriving train—the train approaching and braking, the doors opening and closing, the train leaving the station.

@nudd Tim Nudd is a former creative editor of Adweek.