Two literary characters and a historical figure walk into a bar... It's not a joke – it's the basic premise of Wittenberg, a world premiere play currently running at the Arden Theatre. Wittenberg is a play for smart people, full of historical and literary references used, often, in very funny ways. Not well-versed on your Elizabethan drama or your Sixteenth Century religious history? Well, you can still enjoy the play, but you won't get......