Yes, watching others perform amazing mental feats is fun, but how about doing one yourself? The feat you can learn in this video looks like an incredible memory feat, but actually uses mathematics so simple, that you probably learned about them in your first two years of school. Try and figure out the method behind the feat, before you go to the Computer Science Unplugged website and look at the PDF file that explains the method (this link opens a new window).
This video is part of the Computer Science Unplugged series hosted on Google Video. The idea of these videos is to teach basic computer concepts without actually using a computer. If concepts such as the binary system, sorting and error prevention are alien to you, check these videos out!