There is something about the act of going to the movies that makes us excited and sparks the imagination. Sci-fi and action movies are the best for me because they require a suspension of reality and a boost in imagination. Movies are an art form, so creatives have a natural link to them. It just might stir something up and get your brain unstuck from the doldrums.
There's also the feeling of playing hookie and skipping work that gets the adrenaline flowing a bit more, too. You'll go back to work feeling really refreshed.