A in-banner version of the much loved game "Operation" by Hasbro. Players were challenged to remove all items except for the Blue Shield crest. The idea/insight was built around poking fun at the common practice of Internet self-diagnosis, i.e., you have a headache so you Google "brain cancer."
This banner featured a self-proclaimed staring contest expert who would challenge people to a game of "stare chicken." Some really smart people figured out how to incorporate the built-in web camera on a user's computer to referee the match. This actually went live and worked.