Yahoo Groups uses a CAPTCHA images to prevent subscriptions by bots. I had to try three times before I successfully passed the test, which made me question my own humanity and intelligence. The particular images used by Yahoo include lines crossing the letters, and these make it extremely difficult to tell what a letter is, even for a human. These tests are viewed as particularly problematic from a usability point of view. In my case I was unsure whether a pair of crossed distorted lines was a letter 'x' or just a pair of crossed lines.
Mokalus of Borg
PS - Apparently, I guessed wrong.
PPS - Twice.
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