@Dawn how about image captchas?
Taken from: http://www.sitepoint.com/captcha-problems-alternatives/
Tests that use images other than words may be generally easier for users, since all they have to do is comprehend an undistorted picture, rather than decode distorted language. A prominent (and, I believe, pioneering) example of this is KittenAuth:
The system shows you a set of nine images, three of which are kittens. You have to identify the three kittens in order to pass authentication.





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