Hey, don't forget the Spelling, Punctuation and Grammar Police!
Courtesy comment:
Sometime back I had some of the spelling Nazis giving me Hades over a misspelled word.
So to fight back and give them something to do besides boring others I started to intentionally misspell words in my posts.
Another area is the people who will post an article and then try to restrict the thread to only those comments favorable to their point of view.