Next Sunday, in prime time, Saturday Night Live will present a live, star-studded special honoring the show’s 40 seasons. Meanwhile, tonight in prime time, it repeats a vintage episode with at least one classic bit. It’s the Oct. 27, 1990 episode with guest host Patrick Swayze, and includes the sketch in which Swayze and repertory member Chris Farley portray rival male-stripper finalists at a Chippendales audition.