I thought of this last night. I haven't seen anything like it, so maybe it's my original idea? (Don't have those often! :D)
I have seen CAPTCHA's that simply make you type the words in the image into the box, and I have seen ones that make you solve a math problem. But I haven't seen any yet that simply ask you generic knowledge questions, and so I think that this might be more difficult for a computer to crack. After all, computers can be programmed to try to "read" the phrase, regardless of the background, and they are designed, after all, to perform mathematical operations, but I think my idea might be better.
For example:
Quote:
What fruit is named after the color of its peel? orange
What comes next in the pattern? One, ten, two, nine, three, _____. eight, 8
What is a very common four-legged household pet (three letters)? dog, cat, rat
What is the common name for floating white blobs in the sky? cloud
What color are the spots on a white cow? black
What animal makes the "oink" sound (three letters)? pig
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Of course, it would check case-insensitively and be lenient enough to allow for punctuation in the answer as well as having a plural answer.