A decidedly perverse programming language designed and implemented by Dutch hacker Wouter van Oortmerssen. False is specifically designed for two particular goals: Implementing as powerful a language as possible in the smallest possible compiler executable (the m68k compiler takes up 1024 bytes), and to have as confusing and obfuscated a syntax as at all possible.
Here is a False program that copies one file to another:
ß[^$1_=~][,]#
....and here is one that calculates factorials:
[$1=$[\%1\]?~[$1-f;!*]?]f:
Not for the faint of heart at all. Shudder. The first deliberately obfuscated write-only language was INTERCAL of 1972, but False brought new light on the tradition due to the author's heavy involvement with programming language design on the Amiga platform (he developed the language Amiga E, which was quite popular). After False, a large number of deliberately perverse programming languages started showing up, including (among others):
Apart from Hello World and the other obligatory toys, a number of file conversion utilities, a compression program, the Life cellular automaton, tic-tac-toe and a complete working Breakout clone have been successfully implemented in False.
The False language website can be found at http://wouter.fov120.com/false/index.html