Through Sunday: You never know what to expect from the Minneapolis Underground Film Festival, but you can rely on it for transgressive, trashy and perplexing programming. The program’s sixth annual go-round runs through Monday with the now-traditional mix of experimental shorts and gonzo horror, exploitation, action and science fiction, the kind of movies that used to play in drive-ins or inner-city grindhouses. Who could not be intrigued by Friday’s featurette “Citizen ’Caine,” about a cocaine-addicted, Nicolas Cage-obsessed insurance agent who is confronting the seedy underbelly of the adult film industry in search of his missing teenage daughter? Or “My Only Son,” a short thriller, inspired by “Law & Order,” but with children playing all the adult parts, and adults playing kids? If you’re in the mood for something weightier, there’s the Canadian thriller spoof “Discopath,” concerning the search for a 1970s killer driven to murderous rage by disco music. (St. Anthony Main Theaters, 115 SE. Main St., Mpls., minneapolisundergroundfilmfestival.com.)