Funny Math - Integral Joke

I was looking for a suitable video for my students about Integrals. It is not as simple as it sounds even though the net is full of videos about integrating various functions. My problem is that I can't seem to find ones which use only the methods we have been using during the classes. While searching I found this joke about math. For people who understand integrals it is hilarious but I think others will miss the point.

"Mathemagics": Arthur Benjamin on TED.com

In a lively performance, "mathemagician" Arthur Benjamin races a team of calculators to figure out 3-digit squares in his head, performs a massive mental calculation, and guesses a few birth days. How does he do it? He'll be happy to tell you. (Recorded February 2005 in Monterey, California. Duration: 15:14.)