Developed by Whybin Lawrence TBWA, the posters sport an eerie black and white shot of a classroom and challenge the audience to 'Find the ghost hidden in the picture'.
When a sensor detects someone standing in front of the ad, a spine-chilling scream is emitted and the picture illuminated to reveal a demonic skull.
TBWA claims the ad is the first of its kind in the world. Creative director Jon Skinner said: "The idea is to shock the consumer to gain instant attention. This kind of cut-through couldn't be more important in the lead-up to Christmas, a period saturated with software messages."
