So romantic I could die

As if the "You were the love of my long life" exchange wasn't enough, "Being Human" s3x08 gave us this:

Annie:

What if it was me? Say I didn't die and I got on that train, and so did Daisy, and I don't know, that was my picture in that incident room, not Lia's. What would you do?

Mitchell:

I wouldn't have known you.

Annie:

Play my what if game.

Mitchell:

I'd tear the world apart.