Anal Nation(1990)

Anal Nation is a comedy that follows two curious extraterrestrials who touch down on Earth with an unusual mission: to learn about a specific human practice so they can bring that knowledge back to their home planet. They seek out an expert in the field, who educates them through instructional materials before providing direct, practical training alongside his assistant. The film plays the fish-out-of-water premise for laughs as the alien visitors navigate unfamiliar territory and cultural practices, blending science fiction absurdism with adult humor.