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Now this is creative thinking... Negative CAPTCHA is the idea of having an email field that is hidden via CSS.

The bots will fill out the email and send it, but the humans won't even know it is there. Smart.

One issue is that a real user could have CSS in a way that does show this (disabled, some kind of reader, etc).

The bigger issue is that these guys are smart, and already have gotten around this (which is why I will stick with the logic captcha with unique questions).