My prediction of the final scene.
Jack, Kate (she's just a small town girl) and Sawyer are sitting in a restaurant booth snacking on onion rings, listening to 'Don't Stop Believing. Outside, Locke attempts to parallel park his car and gets in on the third attempt. Everytime the door opens a bell over the door rings, and Jack bricks it. Sitting at the counter is actress Jenna Elfman, looking nervous. She goes for a lash. As she walks back out the toilet, the bell rings again, Jack looks nervous as fuck and it fades to black...