Last night's two-hour season-ending episodes of Grey's Anatomy contained plenty of great scenes, but it's not hard to decide which were the two most memorable of them all.

Fans finally got to see a MerDer wedding, however unconventional.

Unable to break away from the intense developments at Seattle Grace, but determined not to let another day go by without being married, Meredith and Derek decide that they will write their wedding vows right there on a post-it note and make it official. Their way.

It's sweet, romantic and somehow appropriate ...

[video url="http://www.tvfanatic.com/videos/post-it-wedding-vows/" title="Post-It Wedding Vows"] [/video]

Follow the jump (and grab the tissues) for the climactic scene last night, in which Meredith realizes that John Doe is in fact George O'Malley, while Izzie collapses as the Chief and Alex defy the DNR she signed, and the two ailing surgeons reunite in another world ...

Is this the last we see of them? If so, we'll miss them so ...

[video url="http://www.tvfanatic.com/videos/screw-the-dnr/" title="Screw the DNR!"] [/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.