I was watching "Pay it Forward" with a friend of mine the other night. I had never seen the movie, but the concept seemed familiar. One of the main characters, a young boy, decides that he will do something nice for 3 people, who will return the favor by impacting 3 additional people (and the movement snowballs across the country).
WCIC is doing something like this here in Peoria. They're calling it "tag you're it". I actually saw this in action as the Avanti's waitress received a large tip at the table next to mine along with a notecard reading "Tag You're It". What's great about both of these examples is that they're open to anyone -- you don't have to be a member of a specific club or organization to get tagged. It's a "game" that the entire public is playing.
I have another friend who will often anonymously pay for a group's meal one table over. Try it sometime -- you'll be blessed just watching their reaction, so much that you won't even want the credit.