Movies, music, television, books, and any other forms of entertainment.
The entertainment forum has been around for years, and serves as the home for any discussion on movies, TV shows, anime, music and even sometimes books. It's posting rate is slower when compared to the other forums, though it is steady.
As of this article's writing, the Entertainment forum has 5404 posts and 273 topics. Most of those posts come from the staple "What are you listening to?" thread started by dwarra. There aren't really any prominent posters in particular here, as most everyone makes a post in this board from time to time.