How about a movie review sub-forum? Reviewers could post a detailed review and then other posters could discuss it.
I am a movie fan but I don't post much in the thread since it's hard to see if a movie has already been discussed.
If it was a sub-forum you could do a 'sort by thread title' to find if a movie has been reviewed already (would be useful if thread titles were the name of the movie so that this would work) and then add to the existing discussion or post a first review in a new thread.
'jokes and funny stories' is a sub-forum and half the jokes don't have any replies. A movie review is maybe more likely to provoke discussion.