Snow White are Prince Charming must make a decision about the fate of their unborn child in a fairy tale flashback on Once Upon a Time. "Best Laid Plans" is the 17th episode of the show's fourth season.
With the spell of Shattered Sight about to take over, we'd say Mary Margaret didn't know what she was getting in to when she decided to become Mayor, but magical spells happen every other week in Storybrooke.
Be careful. Love is a weapon, Deary. The most dangerous weapon of all which means the pain you should worry about isn't the kind inflicted by a broken sword but the kind that comes from a broken heart.