Passion Pit (1985)

A sign in the Snack Bar asks, "Are you a rocker?" Car hop Jan has sex on the snack bar counter, joined by car hop Judy. Judy's boyfriend, Lewis, is upset to discover them and seeks solace in the arms of the blond projectionist with freakishly large breasts. Meanwhile, manager Ilsa imagines sex with her dream man. A couple on a date has sex in the back of a pickup truck during the movie, and another car hop, Annina, has sex with an older woman. Meanwhile, Jan lets herself be picked up by two guys in a convertible. It's Saturday night, and lots of cars at the drive-in are rocking.