The Thing with Two Heads (1972)
There are almost no words to describe precisely how godawful The Thing with Two Heads could possibly be, so we'll let this brief summary do it for you: A white racist has his head transplanted onto the body of a black convict. Yes, it's that bad, with one Rotten Tomatoes Super Reviewer deeming it "the epitome of corny, campy, cheesy."
The Slugger's Wife (1985)
A baseball outfielder falls in love with a nightclub singer, but his game suffers tremendously when she decides to leave him and focus on her career. "... The silliness of the story gets bogged down in all sorts of gloomy neuroses, angry denunciations, and painful self-analysis," writes Roger Ebert.