Click on your video now, here, get it playing, and then go to the top of the thread and click on General Discussion like you want the Index back to go somewhere else. The video will stop because you've moved away from it, even if you're enjoying it.

Videos that you haven't already listened to, haven't "bufferred" yet often don't load as fast, especially for people who have dial-up; that's why they asked us to put a "Video" warning in titles for posts with videos since not everyone can deal with the YouTubes in the post as it messes up their computer.