This whole thread reminds me of the Seinfeld episode when Elaine and Jerry were flying and both were offered an upgrade because they were ovewrsold in coach and Jerry took it. Elaine was left in a middle seat with an undesirable seat companion on each side. During the flight she sneaks up to the then-curtain divided First cabin and takes teh back seat after climbing over someone in teh aisle seat. She pretends to be sleeping and the FA comes around and she waves them off. the FA then checks the list and sends her back to her coach "prison"