Jean Genet, the baddest bad boy of French letters, made only one film, and this gorgeous swoon of a semipornographic prison fantasy is it. First smuggled into this country by Jonas Mekas, Un Chant d'Amour attracted some hot censorship action before slipping into obscurity for nearly 50 years. See it tonight in pristine 35 mm, alongside short works by Kenneth Anger: Fireworks, Scorpio Rising, and the world premiere of Elliott's Suicide, a film about Elliott Smith. (Northwest Film Forum, 1515 12th Ave, 267-5380. 7 pm, $10.)