Wikipedia Rule 

References the general theory that when a Wikipedia user is on any given Wikipedia article the user is never more than 6 clicks away from something directly related to sex, either through related articles or text-embedded links.

*Note: 6 clicks is a conservative number, in everyday practice the average required number of clicks is lower.

Wikipedia Rule example link paths:
Starting article: William Howard Taft. 1>Serial Killers. 2> Sex.

Starting article: Brooklyn Bridge. 1>Pedestrians. 2>Health. 3> Reproductive Health. 4>Pregnancy. 5>Vagina.

Starting Article: Manganese. 1>Pigment. 2>Cosmetics. 3>Human Body. 4>Male Reproductive System.

Wikipedia Rule by Siddarthan October 2, 2010

wikipedia rule of google 

Anytime you google anything one of the first 10 hits will always be the wikipedia article about it.

I typed 'google' into google and the 3rd hit was the article on google at wikipedia, thus demonstrating the wikipedia rule of google.

wikipedia rule of google by rustyshackleford November 2, 2007