The CAPTCHA to end all CAPTCHAs

I love CAPTCHAs. The amount of comment spam and contact form spam I have been getting has all but dropped to zero since adding a simple 3 letter CAPTCHA to my site.

However, some CAPTCHAs can be a little tough to crack. Here's the best example of this I have seen yet, found on http://www.prcheckingtool.com/ (Yes, I heard rumours of an update, and I'm feeling insecure about the length of my green bar).

Evil CAPTCHA



Here's that puppy at an enlarged size. Doesn't make it any easier really.

Evil CAPTCHA



Wow. Evil. I don't even know where to start with this one. I think I'll use another PR checking tool instead.
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Tags: usabilitycaptchacaptcha usability