here's an excerpt from the Pay It Forward Foundation:
Start a revolution--it begins with you!
The premise of the novel Pay It Forward is one that any person can implement in his or her own life, at any time. It begins with doing a favor for another person-- without any expectation of being paid back. Indeed one would request that the recipient of that favor do the same for someone else: ideally for three other people. The unconditional favors can be large or small. As the fictional 12-year-old Trevor observes, "It doesn't have to be a big thing. It can just seem that way, depending who you do it for."