Most Saccharine Sweet Exchange:TwilightOnly Twilight's Bella would spend her very first slow dance with the man of her dreams complaining about his refusal to let her join his band of bloodsuckers. Eyerolls aside, it's hard not to be moved by the tenderness in Edward's gazebo gaze. A couple of movies later, the happy couple wed to the tune of their prom song: Iron and Wine's "Flightless Bird…