But the adventures of the knight and his horse (Royer Bockus) and squire (Ben Steinfeld) are beautifully silly. The interruptions of the grocer and his wife are better still, especially when Nell is pulled onstage to play a pan-Slavic princess who talks like Dracula. Best of all, though, is the Fiasco mien, which favors a giddy, affable, let’s-put-on-a-show quality. The actors are clearly enjoying themselves (Steinfeld, who sings most of his lines, often accompanied by Bockus and the actor and multi-instrumentalist Paul L. Coffey, even more than the rest). And their performances carry with them a swaggering sense of rehearsal room experimentation and delight. They seem to be performing for the sheer pleasure of it, with the audience a welcome afterthought.