As Poli says, the normal explanation of this that I've heard is that since I don't know if you've ever seen a movie you don't like (maybe you've always loved every movie you've ever seen), then I have to use the subjunctive to formulate that question, since it's an uncertainty or speculation. The use of the word "que" is another clue. It likes to be followed by the subjunctive.
I'm sure someone else can give a better explanation.