The 10 Most Shocking Grey's Anatomy Moments

In what appear to be Izzie's final moments, she has a vision. She's in the dress she wore on the night of Denny's death. She's on the hospital elevator, and George is on the other side of the doors in his full army uniform. The scene is like a triple punch of heartbreaking moments rolled into one: We remember the death of Denny Duquette. We remember the loss of George. And we know we might lose Izzie. When she's alive, it's a reminder of the show's founding principle: fate is arbitrary and ultimately unfair. Why does Izzie survive when George and Denny die? We'll never get an answer.