I have been unable to submit a comment in a site with spam karma enabled. So I wrote a comment in the spam karma plugin site. Wonder of wonder's the spam karma filter trigerred again! And then it took me to a CAPTCHA plugin :)
After validating it complained again by throwing me a beautiful looking sql script.

The filter thinks its my fault that I have a single quote in my post!

The bottomline: Karma Filter you are collecting some really bad karma :)