A Brainfuck derivative where every command is a variation of the word "moo". Sean Heber , 2003
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Cow was created by Sean Heber in 2003 as a comedic take on Brainfuck. Every one of its twelve instructions is a capitalisation variant of "moo" — from moO (increment the current cell) to MOO (begin a loop) and OOO (set the current cell to zero). A notable addition over Brainfuck is the integer register activated by MMM, which can store and retrieve the value of the current memory cell, enabling slightly less painful arithmetic.
Cow programs are long, visually absurd, and completely impractical — a Hello World requires upwards of sixty tokens. That is entirely the point. The language is a love letter to minimalism taken to its comedic extreme, and running one successfully feels like a genuine achievement.