dude, i forreal cried watching the little mermaid with my daughter the other day lol no lie. before birth control, i probably would have laughed.
While I'm not a girl, I had a sane exGF try to slit my throat with a steak knife due to my being ten minutes late to pick her up. She later spent three hours crying in the bathroom at a restaurant. She was three weeks into a new pill reg. So, yeah, I will vouch that they can cause insane mood swings.