"Case Closed" (Detective Conan) wank
This one hardly comes as a surprise. Detective Conan, one of the most popular series in Japan, had just been dubbed. The first dub episode aired on Adult Swim on Monday complete with a changed title, and changed names. A dub-only fan has shown up on detective_conan and spouted fangirlisms about how hot the (dub) voices are using only the Anglicized names In this thread enjoy a rant about how stupid the name change from "Detective Conan" to "Case Closed" due to copyright issues is, and death threats for not knowing the original names.

This is followed by another new dub fan who complains about being "pelted with Japanese torrents" and then says they will do whatever they can to keep the peace.

Finally the first rabid fan decides things are too quiet, so she must remedy things by posting every new tidbit that she finds online as news The regulars somehow don't seem impressed.

EDIT: Minor update, but there's a lovely thread rebuking the elitists for their treatment of the newbies and another in which the topic of spoilers comes up and someone protests against ghettoizing the fandom.