Change for a Dollar (2010)
Change for a Dollar is an short film by Sharon Wright. The short movie follows a seemingly homeless man wander through the course of a day, in which he gives away the dollar in change was dumped into his tin can. Following the course of how the "dollar" was used, the viewer essentially gets an eye-opening opportunity to watch lives changed, based on the premise that it doesn't take much to make a difference.
More at Wikipedia.