My theory is that it was a secret agent trying to transmit Russian nuclear launch codes to someone.
I think I may have missed something (again).
Some spambot created a whole bunch of threads that were just gibberish codes. I suspect maybe they were part of its functionality that defeats Captcha images.
Hmm… Taken care of so quickly I didn’t even notice…
Speaking of Captcha
Ah, yes, the awesome that is XKCD… 
Well, this is a forum for a game based on comics.