what is scary movie 1 based on

Scary Movie 1 is a parody slasher film that was released in 2000. The film is a spoof of several films and television shows, with a primary focus on Scream and I Know What You Did Last Summer. The opening installment of Scary Movie, for example, is a Scream parody, featuring a similar mask, plot, and characters. It also mocks Screams lack of plot. The film also parodies other horror movies such as The Exorcist, The Sixth Sense, The Matrix, The Shining, and Halloween.