Scary Movie 4 is the fourth film of the Scary Movie franchise and is directed by David Zucker, written by Jim Abrahams, Craig Mazin and Pat Proft, and produced by Craig Mazin and Robert K. Weiss. It is distributed by The Weinstein Company via its Dimension Films unit in the U.S., and internationally by Buena Vista Distribution (Miramax). It was released on April 14, 2006.

Plot

The main plot parodies four movies; The Grudge, The Village, Saw (series), and War of the Worlds.

The film opens as Shaquille O'Neal and Dr. Phil wake up chained in a bathroom with only two minutes to escape as their host, Jigsaw, reveals the room is being filled with a nerve gas. After a few tries, Shaq manages to make a successful free throw with a huge rock in order to get the saw down to cut off their legs. However, Dr. Phil ends up sawing off the wrong foot, thereby remaining chained as they die.
The story begins when Cindy Campbell visits her ex-brother-in-law Tom Logan (Charlie Sheen), maintaining continuity from Scary Movie 3, who is helping her in her healthcare profession. However, in spite of being in a relationship with three girls, Logan tries to kill himself by taking an overdose of sleeping pills. But he accidentally ingested Viagra pills, resulting in him tumbling over a balustrade and landing on his erect penis, dying a painful death. Later, Cindy receives a tour of a creepy house by the healthcare supervisor, who tries to hide the supernatural stuff caused by a boy before Cindy takes the job of caring for the house's incapacitated owner Mrs. Norris (Cloris Leachman).