Some showings of the first Hobbit movie will be displayed at 48 FPS (frames per second), which is twice the speed of standard films. The author of the linked article says the difference is noticeable and can be distracting enough to take away from the film. On a side note, I’ve always wondered why I could immediately determine if a television show was a soap opera. Turns out the answer is that they use a different frame rate. Wonder if that’s also true for those older BBC shows, which can also be identified at a glance.