Post your favorite anti-troll picture here, then just send the link to that dirty troll or flamer you're having problems with! Will it help the situation? No.... but it'll be fun! Plus a picture is worth a thousand words, so an entire thread of pictures has to be worth something more.
Enjoy, and remember that forum trolls have lost 99% of the reasoning sector of their brain. If they don't get it after 2 posts, just let the topic die.