The International Obfuscated C Code Contest (abbr.
IOCCC) is a
programming contest for the most creatively
obfuscated C code
held annually since
1984 (with the exception of
1997,
1999, and
2002).
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.