For which movie would you like to have seen a sequel?
None come to mind. A good drama tells the most important events in its characters’ lives. That’s one reason why television is melodrama—because any real human being subject to the trials of a television life would be dead, imprisoned, or insane. A movie which leaves too much for a sequel fails to be good enough to deserve a sequel.
Better question: for what movie would you like the sequels never to have been made?
For what book would you like the sequels never to have been written?