The IOCCC (Internet Obfuscated C Code Contest), is a sometimes annual competition between computer programmers that began in 1984. Contest entries must be written in the C programming language, in an obscure or obfuscated way. Winning programs have a purpose that is unclear, hidden, or cleverly designed.
As of 2017, 24 IOCCC competitions have taken place, with 2018 suggested as the likely year of the 25th competition.
An example of a winning program is "duble," winner of the 2015 prize for "best handwriting." The code for the program looks like this: