What happens: After just sadly handing Meredith a ring, Derek transforms into the McDreamy we know and love, proposing to our dark and twisty heroine in the most romantic way possible. He plasters one of the elevators at the hospital with CT and MRI scans from all the cases that they worked on together. With a little push from Dr. Webber, Meredith gets on the elevator. Derek tells her that he's going to marry her. Then, our hearts exploded. The end.