It's even for a human to recognize that stuff. I usually get the captchas wrong a few times before getting it right, I supose that it'll be even worse if people start doing that.

Even worse: A partial derivative captcha

http://brad.livejournal.com/2331278.html

I got one where the clue was, "People who annoy you".

It looks like somebody trying to be clever. It's an obfuscation of the word 'pussy'

All Captchas should have animals in them