If you've yet to see this incredibly zany musical comedy that pays a respectable tribute to the genre of Disco music, you had better make time to. Produced during the era of the disco rage, Thank God It's Friday, directed by Robert Klane, is a cult classic for a reason. It had been exactly one week after seeing "Grease" that my mother, my brother, and I spent our traditional "Movie Date Night" seated in the middle row inside of the old State and Lake Theater in Chicago, taking in the groovy visual sights and sounds of Thank God It's Friday on the giant silver screen. And we three loved it; it ...