Your first question would be what the hell is CAPTCHA or CHACHACHA or whatever it is???
A CAPTCHA (IPA: /’kæpt??/) is a type of challenge-response test used in computing to determine whether the user is human. “CAPTCHA” is a contrived acronym for “Completely Automated Public Turing test to tell Computers and Humans Apart”, trademarked by Carnegie Mellon University. The process involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade, but not able to solve on its own. Because computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human.
The term CAPTCHA was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper (all of Carnegie Mellon University), and John Langford (then of IBM). A common type of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen.
Ok, now coming to the real point. You may have seen lots and lots of CAPTCHA images but I am pretty sure you would never have seen such a funny one. Check this one from facebook:
Evil Laughter!!!!!!!! 