Oh man as to really bad Movies, I'd have to say 1966's 'Manos: The Hands of Fate' by One Hal P. Warren, comes instanltly to mind!
The Protaganist a Tom Cruise / Traper John' look'a'like with really BIG KNEES! And a whimsical Themesong noted to be more Comical then HORROR! Presides over this Brigadoon style House "While the Master's away.". Trap this young Man (the Director / Producer), His wife and Kid and there adorable pet Puddle Scruffy: The Wonder Poodle. After what must feel like half of enternity watching them going up & down the backwoods Roads. "uh there's a Filed... and another field... and another Field. Oh yes it's very senic just like a Scene from 'Manos the, the Hand's of fa fa FATE NOOOOOOOOO!!!!
And that's the MST3k version. I don't think I could survive a Theatrical Screening of such a Film. and lord knows MST3k is known for bad Movies only the 'Deep Hurting' (Rock Climbing) Hucleses Movies would come as a close Second!!!!