One of the big box office successes of the year so far has been the horror movie Insidious , from director James Wan and writer Leigh Whannell. The film, starring Patrick Wilson, Rose Byrne, Lin Shaye, Ty Simpkins and Barbara Hershey, opened in theaters on April 1 and has earned $52.7 million domestically. That's on a budget of just $1.5 million. ShockTillYouDrop.com talked to producer Jason Blum this week about the possibility of a sequel. ...