 During the blood geyser scene, the spinning room turned incorrectly  and cause a premature flood of "blood". According to the DVD  commentary, the people pouring the "blood" were shocked when the  wires were hit with the water and the room began to spin out of  control. Wes Craven remarks that it was like the Ferris Wheel from  hell. The power on the set went out and Craven said they were all in  the dark and covered in blood.