Super CAPTCHA?
If you don’t know, CAPTCHAs are those funny looking characters you sometimes have to type in before you can submit a web form. My favorite implementation is reCAPTCHA because in addition to verifying you’re not a robot, you’re actually helping validate words from digitized books.
Last week I saw another interesting implementation. I’m not sure how many robots will be able to get past the mechanism on o.rang.es:

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