Mary Winchester: Let me guess... she made a bad demon deal?

Bobby Singer: Opposite. She didn't make one. Lost the love of her life. Never moved on.

Mary Winchester: And Dean and Sam were never born. Bobby, I made that deal. And it- I... brought my boys a... lot of pain. But... What happened here, in your world? Sam and Dean stopped that war in mine.

Bobby Singer: Then I'd say you made the right choice.