I just found this out from xkcd.com; specifically, this comic's alt tag text.
"Wikipedia trivia: if you take any article, click on the first link in the article text not in parenthesis or italics and then repeat, you will eventually end up at Philosophy."I tried it twice. With the speed of light (took 8 clicks), and Teenage Mutant Ninja Turtles (took 15 clicks), and it totally happened. (As a side note, what does it say about me that those were the first two articles I searched for when testing this hypothesis? Your comments are appreciated.)