Interestingly Brainfuck has a use, though it is an obscure one. It's proven to be turing complete, and has a rather trivial set of instructions and rules. If

Interestingly Brainfuck has a use, though it is an obscure one. It's proven to be turing complete, and has a rather trivial set of instructions and rules. If you can write an interpreter for it in another language, you prove that language to be turing complete as well.