pay it forward is a book, written by catherine ryan hyde, which was later made into a movie of the same name. in the movie, a young boy, trevor, was challenged by his teacher to come up with an idea that could change the world and put this idea into action. trevor decided to do a kind deed for three different people. these people then did the same to other. each of these three people then did the same good deed for three other people. as a result, trevor's one good deed led to nine acts of kindness and so the cycle continued.
trevor may just be an imaginary character, but this work of fiction has been put into practice by the random acts of kindness foundation, an organisation set up to encourage people to carry out good deeds. people all over the world are experiencing the pleasure of having kind deeds done for them and they in turn reciprocate