Guerrilla Marketing - Saw
It's a guerrilla marketing project to promote the latest Saw film. It consists on a simulation of a crime scene caused by one of Saw's trap. A giant circular saw would be installed at the end of an underground escalator. People couldn't use the escalator it would be unavailable, like if a crime was committed and a death person was there. (Obviously the saw wouldn't be running and on the floor would be blood splatter).
Two man wearing policeman suits would be hired to make the scene more believable.