Ok, call it obscure… At http://www.esolangs.org/wiki/Befunge we learn that “Befunge is believed to be the first two-dimensional, ASCII-based, general-purpose (in the sense of “you could plausibly write Hunt the Wumpus in it” [1]) programming language. Its form was influenced in part by the multimedia scripting application AmigaVision, and in part by Forth.” Here is the interpreter for it.