I just found this video on Canadian math teacher Darren Kuropatwa's blog (awesome blog), but then decided I liked the version on Taylor Mali's YouTube page better. This is a story/poem that I had heard a version of a few years back about how teachers make a difference in their students' lives. The video is of the author, Taylor Mali, performing the poem. My sentiments exactly!
And this is a different version of the same poem, with the words on the screen. I think the slideshow was made by Scott Schwertly, or at least I found it on his Slideshare page.