Digital Wanderer

It occurred to me that a captcha could be made using javascript. Googled it. Seemed like the question had been covered ages ago. But a quick search didn't find the idea I had. I mean generating not a picture, but letters out of little dots flying around the browser. You wouldn't be able to bypass that with the usual captcha-beating methods.
The only bad thing is that you need javascript turned on.
UPDATE: On second thought, writing a special hack to bypass this kind of captcha won't be hard - you run the javascript and take a screenshot - you get a picture that can be recognized the usual way.
UPDATE: The next thought that came to mind was that Google can easily steal ideas that users type in to check if their new idea already exists. And no one will prove a thing - everyone knows Google is full of talents who come up with all sorts of stuff.