Introduction

When your Stack Overflows, you forget whatever you were talking about. If this happens very badly, to the point where you can no longer speak straight, we call this a "Flak-Overstow". This language is stack based, designed to hurt your brain, and very similar to Brainf*ck, so it seemed appropriate to name it "Brain-Flak".

--Brain-Flak Creator DJMcMayhem, Programming Puzzles and Code Golf meta

Brain-Flak is a "Turing-tarpit", a language which can, in theory, compute anything, but in reality is inconvenient and painful to use. It was heavily inspired by Brainf**k, the original Turing-tarpit.