alternative captcha methods

Question

I\'m looking for inspiration here. I need to employ some sort of human verification for my website, but the most common method these days (asking users to type the letters &

Answer 1

I particularly like the "which animal can fly" example. Simple & Effective.

But this kind of thing could be abused. It wouldn't be difficult to give it a cultural bias — or a perceived one.

And, as austin cheney showed, it could easily become a sort of intelligence test, and you would have an Accessibility problem.