Delirium Parent Guide You'd be crazy to live here. Disturbing things happen after a man inherits his parent's mansion -- and despite his past history of mental illness, he's sure it is not his imagination. Why is Delirium rated R? The MPAA rated Delirium R for some violence and disturbing images. News About "Delirium" Cast and Crew Delirium is directed by Dennis Iliadis and stars Topher Grace, Genesis Rodriguez, Patricia Clarkson .