My friend Jenny Lawson (aka The Bloggess) has a comment policy, in which she reserves the right to take the postings of the most obnoxious trolls in her comment threads and change the words to something else entirely, subverting the message of the troll.
In many ways, I prefer this to something like Making Light’s disemvoweling.
For any commenter outraged that his post has been thus kittened: Good, you sad little smudge of a human. If you’ve been kittened, your only purpose in coming here, in my estimation, was to shit all over the carpets. I like my carpets shit-free. So you get what you deserve.