The premise is quite simple. First, find a useful Wikipedia article that normal people might read. For example, the article called "Knight." Then, find a somehow similar article that is longer, but at the same time, useless to a very large fraction of the population. In this case, we'll go with "Jedi Knight." Open both of the links and compare the lengths of the two articles. Compare not only that, but how well concepts are explored, and the greater professionalism with which the longer article was likely created.
I don't read SA often and I never read their message board, so I'm not sure if this has been covered (probably has), but here's a topical Wikigroan for you -
Hermione, the daughter of Menelaus and Helen of Troy (Greek mythology).
Hermione Granger, witch (Harry Potter).