41.   The film is based loosely on the romance and marriage of its producers.

42.   The film is based on a bestseller by William Peter Blatty, which was inspired by an actual exorcism in the Washington, D.C., area.

43.   The film is based on a comic book by Lowell Cunningham, who says he heard the story from a friend.

44.   The film is based on journals Scottish gentlewoman Grace Elliott kept, detailing her experiences in and observations of France, her adopted country, during the Revolution.

45.   The film is based on the book of the same name by Walker Hamilton, written two decades ago.

46.   The film is based on a script by John Cassavetes, the late actor and one of the forces behind independent cinema in America.

47.   The film is based on the Nick Hornby novel about emotionally adolescent Rob, the owner of a rundown used-record shop.

48.   The film is based upon a novel by Peter Hoeg.

49.   The gritty, frequently grisly, film is based on a psychological novel by Friedrich Durrenmatt, turned into a cinematic study in obsession.

50.   The new film is based on this novel.