The International Obfuscated C Code Contest

[Programming contest]? for the most creatively obfuscated C code held annually since 1984 (with the exception of 1997 and 1999). There are many winning entries each year, and each entry gets a "category" like "Worst Abuse of the C Preprocessor" or "Most Erratic Behavior".

One notable IOCCC winner (in 1986 and 1987) is Larry Wall. His achievements in IOCCC might be or might be not related to his design of Perl.

Contest home page: http://www.ioccc.org/