At the ASTD-OC learning event the other day, one of our colleagues teed up a structured networking event by discussing the key precept in the video below: changing behaviors by making something fun. The video was produced by Thefuntheory.com.
If you liked the experiment above, I also found the one below as compelling, if not more, because the repetition encouraged by the "fun" factor really demonstrated the potential for this approach to really "clean up." (Pun intended.)