FortyTwo
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I have never seen a Happy Potter Movie and every time I try to watch Serenity I fall asleep within 15-20 minutes.
The first part you should totally rectify! The HP books were really, really good and the movies lived up to them astonishingly well, unlike most novel adaptations.
As for Serenity, it actually seemed more exciting to me than Firefly. Don't get me wrong, I love them both very much, it just seemed like their attempt to reach a larger audience made the movie more action-ish and gave it more of a typical sci-fi feel.