Corrected entry: When Father Damien first sprinkled tap water onto Regan, she was screaming as she was in pain. Later in the movie, Father Merrin sprinkled holy water onto Regan and that burned her as well. Wouldn't tap water, which was not blessed, have no effect at all compared to holy water?
LuMaria 1
2nd Sep 2004
Correction: Because she screamed in pain when splashed with tap water (after being told it was holy water), Father Damien had a hard time proving that Regan was actually possessed to the other priests and bishops. Simply put, her first screams were a plot point to make things difficult for Father Damien, and not a mistake.
LuMaria 1