I always had this idea for a video in my head for Sad Beautiful Tragic.
It was in black and white, set in 40's.
She drives to a train station after leaving the note in his coat pocket.
She looks at the locket with his face, then boards the train.
She goes to her train room and flashbacks of them dancing, laughing, conversations, kissing goes through her mind as the train is going through different cities.
And towards the end the train has 'ran off its tracks' and reveals that he had gotten on the train after finding her note. And their bodies are together, lifeless. With the note on his chest and the locket on hers.
Something like that.
This probably sounds cheesy, but I thought it made sense, I guess.