A couch-mounted facesit is one of the most effective maneuvers one rival can secure on another.
In such a hold, the body weight of the victim lies sprawled out below, but the weakest point of their neck remains firmly balanced on the edge of the hard couch base, leaving them almost no method by which to escape.
Such being the case, the only counter left remaining is to cling desperately to the breath you still have and hope that such will not escape your lungs before your opponent tires of the hold, or decides, foolishly, that you are unconscious already.