When the subject of the "worst movie ever" comes up, someone will always mention The Room, Plan 9 From Outer Space, Howard the Duck, Birdemic, Troll 2, and Manos the Hand of Fate.
James Rolfe of Cinemassacre disagrees that any of these films are truly bad. Movies that are unintentionally funny because of their poor execution are still entertaining in their own way. Movies that were produced in order to be considered "bad," like Sharknado, don't count, either. The truly bad movies are the ones you've probably never even heard of, but Rolfe will introduce us to one movie that is so bad that you don't even want to read about it, much less check it out. But if you can't help yourself, you can read about Wavelength here.