I like the ones with crooked letters that the robot can't read. They are widely used, so it's just a matter of time before they figure out a way around them.
Howard

> I ran in to the same problem a while back, and devised a solution very similar to yours. As one step of the registration process, users were shown a picture of a litter of kittens sleeping on a pile of muffins, and were then asked to describe how the picture made them feel. If they answered "cold and impartial", it was a no go. Computers may be smart, but they aren't Heart-Smart. No sir.
>
> (The correct answer is hungry)