Brainfuck

Brainfuck is an extremely minimalistic, fully competent, Turing-complete esoteric programming language created in 1993 as more of a theoretical joke rather than a tool for real-world software development. With just 8 extremely simple commands, Brainfuck code can be used to write algorithms performing virtually any computational task possible.

Due to its simplicity, Brainfuck has a very shallow learning curve. It takes 5 minutes to learn but days of active thinking to master.