I always envision DALLAS bringing in two big movie stars -- people who wouldn't ordinarily do series television -- to play themselves playing J.R. and Sue Ellen. Maybe somebody would do it as a lark since it's only a couple of episodes. Like an SNL appearance.
I picture Christopher Walken and Kathleen Turner, their scenes as "J.R. and Sue Ellen" played like VIRGINIA WOLFE, the melodrama done to hyperbolic excess from what had even occurred between J.R. and Sue Ellen in real life. With screaming and maybe even some physical violence thrown in.
As producer Sue Ellen stands behind the camera, approving it all.