Here's a new Captcha (Completely Automated Public Turing test to tell Computers and Humans Apart).
I've mentioned this kinda thing before. This is the sort where you show a series of pics and get the human visitor to click on the kittens, or in the case of Hotcaptcha, click on the three attractive young fillies (and you can also choose blokes, if you're so inclined).
Even though looks are subjective, it appears machines can't tell the subtle differences between the munta and the hot tomali, at least not yet. No double chin, burberry detection, facial fuzz or goth make-up analysis software available as yet.
The code for this is available to use on your own site, and it's way more entertaining than just typing in some bog standard wiggly text. It's also an outstanding and commendable abuse of technology.