10. Hollywood Hot Tubs (1984)
Directed by porn auteur/actor Chuck Vincent, HHT goes past "good" on the so-bad-it's-good scale, past "bad" again, and graduates to "sublimely ridiculous."
The plot: teenager gets in trouble with the law and is forced to either go to jail or work for his uncle's hot tub company. As you may have surmised from the title, he goes with the hot tub company, and sex, rampant toplessness, and atrocious acting ensue (not to mention a grandma "orgy"). Kiddies: that young lady bouncing like she's on a perpetual pogo stick is Jewel Shepard. Do your research.