There are fun videos of physics in the net. I occasionally look for them for my class, but my results tend to be random. A reasonably good list can be found on a website that specializes on Online education here.
Their list includes one of my favorite demos, which I performed in class this year as well: The Ruben’s tube. It is very cool to do and to watch as well. After I worked it the students clapped. Of course, there was also the time I played the guitar to show harmonics, and the time that a superconductor had issues with going to zero resistance after cooling during class.
That rocks!
The associate dean says I can’t do this one. Something about the fire codes.
It took me a little while to find this, but I think you could call it a Ruben’s tube on steroids
http://www.brown.edu/Administration/News_Bureau/2006-07/06-174.html