What's the most inspiring talk you've ever watched [online]?

Shankar here. I'm curious to know what's the most interesting talk you've ever watched. Please share it here along with a link to it. My most favourite talks are from Sir Ken Robinson.

His two talks are just mind blowing. He's humorous, yet he conveys a great message for his audience. His profile is here: http://www.ted.com/speakers/sir_ken_robinson.html and his talks are featured in the panel on the right.

Many of you may have heard of him, but those of you who're just hearing about him: his talks are gem. Don't miss them. He talks about how traditional schools are killing creativity and why the system needs a revolution.

Now, can you come and share atleast one talk that you really inspired you to do something? Something that also inspired the kids you teach. 

I can't wait to see your replies! :)