I got quite tired of filling in captchas... Because I am colour blind, many of the captchas are hard to decipher. I used to mull over the form containing captchas (reload them, etc.) and it struck me that I could possibly use captchas for some kind of educational exercise. So I wrote a "different" kind of captcha, that picked up existing words in dictionaries and mangled them... and the user got a chance to read the meaning of the word. Hmmm... this is definitely an odd way of spending time on a form, but it could be useful in say educational sites, etc.

It is NOT meant for a very high end, extremely secure kind of captcha, but it does reduce the hassle for the end user because the original word is also given. So the letters of the original word act as clues for the mangled characters in the captcha -- thus helping people like me who can get confused between "f" and "i" etc, if placed on an inappropriate colored background

Well, you can read all about it here: http://www.syncspace.com/go/Capteacher