 FAKE: SPOILER: When the toilet is leaking in the bathroom when Tod  gets strangled, the water is leaking from the water line valve not  the tank. However, the water running down the tile is blue as if it  came from a tank that had toilet cleanser in it. In the directors  commentary, they explain that the water they used was deliberately  blue so that the audience could see it better. if the water had been  ordinary clear water it would be nearly invisible to the audience.  However during this scene, if you look carefully you can see the  floor has been built sloping down slightly obviously for getting the  water to run across the floor.