Pay It Forward. If you've ever seen the movie, you'll know what I'm talking about. For those of you who haven't, here's a short, very general summary:
In the movie, Trevor, the main character, is enthused about the assignment given to him by his social studies teacher, Mr. Simonette, to change the world. Then, he created the movement of "pay it forward;" he would change three people's lives, and, in turn, those three people would each change three other people's lives, and the movement continues, growing exponentially. By the end of the movie, so many people's lives had been affected, starting with just one person.

