We have all had a class where we show a youtube video and one of several things happen
1. The internet drops out and you can’t load it
2. The video finishes and all manner of inappropriate things pop up on the screen, accompanied by students begging to watch another video
3. The video plays commercials or buffers off and on losing precious lesson time
A quick and easy solution for this is using the website http://keepvid.com/ to download the videos in advance onto your desktop. Avoiding all those problems.