From Testicles to Post–Tsarist Russia in 1 click!

http://thewikigame.com/ is just about the most fun you can have with Wikipedia, and surprisingly addictive.  The goal is to click from one randomly chosen Wikipedia article to another randomly chosen article in the shortest amount of time possible (they also have variations for fewest clicks, fewest clicks to find "Jesus", 6 clicks exactly, etc.)  Give it a shot!