Although they are not mainstream programming languages, still are quiet productive in solving special type of questions, they are fairly popular among security analysts and hackers, and are extremely light (a compiler of one such language, ‘brainf*ck’ is only of 100kb approx). Since good tutorials of such languages are difficult to find, can people at codechef compile some information and tutorials together to help the interested ones know/learn more 'bout them.
or ateaast codechef users please share the special knowledge about these languages and other interesting facts about anything else that you find cool. 
happy programming