What are everyone's favourite Grey's moments?

I'm never going to forget the final moments of season 5 with George and Izzie and that song, that moment with the elevator was just done brilliantly.

The shooter episode, when Bailey is trying to save the intern. My heart.... it breaks!

Of course (SPOILER)Lexi's death. It killed me, absolutely broke my heart and I still can't watch it. Urgh!But my GOD it was well done.