Harry Potter series, I wasn't much of a fan until I watched one high. I get such a magical warm feeling from the costumes and buildings and shit. I love watching the parts containing the Weasley house. It gives me a cozy feeling eh. It inspired me to read the books.
I also watched Barney's Halloween Party once, I was so high and it was . . . strange. Before that point, I absolutely could not stand Barney - now I let my kid watch it when ever she wants. Crazy, I know.
Firefly is always awesome, being high just makes it all that much better. I usually like to relax with a movie I've seen and liked, than to risk a good buzz on a shit movie.