Do you want to include a video in your course? There is a plethora of video sharing websites available (see http://en.wikipedia.org/wiki/List_of_video_sharing_websites, but the most popular has to be YouTube. There are dozens of Pythagoras-related videos on YouTube, and one that always keeps my classes entertained is Darth Vader Explains the Pythagorean Theorem by Mister Teacher (also known as John Pearson) from learnmegood.com:
The problem I have is that, although I can get access to YouTube at school, my students can't (my staff login is different from a student account). How do we overcome that problem? The best way is to extract the video from YouTube and upload it to our course files area. We can then link to it and have Moodle embed a video player, just as it did with its own audio player in the previous section. Here's how to achieve this using Keepvid.com: