Derek and Meredith earlier planned to go down to City Hall to tie the knot officially, but they just don’t have time. Derek assures her that they could go another day, but Meredith is right, “There is no other day. Every day is like this. Every day is a crisis. I love you and I want to marry you today." Smiling, Derek asks her for a piece of paper and proceeds to write down impromptu vows on a post-it and sign it. Meredith is a little skeptical, “This is our wedding? A Post-it?” She signs it anyway and the two of them kiss to seal the deal. Man and wife!