If you have a sudden urgent need to talk to every egghead film-buff Boho in Dallas, what you do is bring a folding chair and park in front of Premiere Video on a Friday night. In the course of a few hours, they'll all come through. In fact, there are entire multigenerational families of film-buff Bohos who gather here on Friday nights--little skaties with their beatnik grandparents. And why? Try 20,000 foreign and domestic titles, a knowledgeable staff and...the scene. Some people believe they need to be seen here on Fridays whether they rent a movie or not. Monday through Saturday 10 a.m. to 10 p.m., Sunday noon to 10 p.m.