CAPTCHA's, though helpful to the webmasters do irritate the users a lot, especially when they are unreadable or are in a format that can't be translated to unformatted text like subscipt, superscript notations, special characters not available on the keyboard or in the worst case images. And that was what happened to me just a few minutes ago. And here is the proof:
I do understand that many of you who haven't experienced similar things wouldn't believe me for sure. All that I can say to convince you'll is that I don't have the skills to make people believe in me. 
Have you'll come across such CAPTCHA's in the due course of commenting on blogs or else where. If yes, where was it and what was the difficulty involved in it: formatted text, foreign language, image or something else....
For those who haven't had a similar experience, do you believe in what has been said above ? 
Probably at that time, I felt that I had to type in the second image as the answer. 
