The Wikipedia Game
I once told a coworker that I was pretty sure I could get to the Wikipedia article for "Jesus Christ" within three clicks from any other article. She was skeptical, so we put aside less important matters, like completing the tasks for which we were being paid, and put me to the test. I might have had to use four clicks one time, but I was pretty good at it. But what followed was even more fun.
In short, we devised a game where we would both start on the same Wikipedia entry, and see who could get to another specified entry in the fewest clicks. A race. How many clicks does it take you to get from "Mexican street food" to "George Clooney"? Who can go from "Honesty" to "Roast beef" the quickest? Or perhaps most important, who can think of the most hilariously unrelated pair of articles?
So, to summarize:
1) Pick an opponent you know you can dominate.
2) Choose two Wikipedia articles, one to start on and one to finish on.
3) Both players go to the chosen starting Wikipedia entry, then begin. Whoever can get to the chosen finishing article in the fewest number of clicks wins. No typing allowed, and going back counts as a click.
It's all about strategy, and it's important work.