Denny is Back?!?!?!

OK, so did anyone watch Grey's Anatomy last night? All I can say is "tear"!!!!! I was so shocked that Denny was there at the end, just sitting so perfectly on Izzie's bed. I think that my heart literally skipped a beat. Oh, and then she was able to touch him, her one and only true love!!! I had tears welling up in my eyes and tried to hide them from Mike with no avail. I know that Denny has to be a figment of Izzie's imagination, but tonight as I lay my head to rest, I will think of them together in a perfect world. If anyone has any insights on last nights episode, please let me know. I need some understanding!!!